Geoscience Ontology, Rock TypesGeoscience Ontology, Rock Types

Igneous material with more than 63 percent SiO2.

after LeMaitre et al. 2002

Igneous rock with more than 63 percent SiO2.

after LeMaitre et al. 2002

• gsrm:Acidic_Igneous_Material ^c
• gsrm:Igneous_Rock ^c

• gsrm:Dacite ^c
• gsrm:Granitoid ^c
• gsrm:Quartz_Rich_Igneous_Rock ^c
• gsrm:Rhyolitoid ^c

• Alkali olivine basalt is silica-undersaturated, characterized by the absence of orthopyroxene, absence of quartz, presence of olivine, and typically contains some feldspathoid mineral, alkali feldspar or phlogopite in the groundmass. Feldspar phenocrysts typically are labradorite to andesine in composition. Augite is rich in titanium compared to augite in tholeiitic basalt. Alkali olivine basalt is relatively rich in sodium.

• The definition of tholeiite and alkali basalt here are more prescriptive than those found in most reference authorities. This is to actually provide some descriptive criteria to allow assignment of rocks on a hand sample basis to the tholeiite or alkali basalt categories if detailed petrographic or chemical data are available.

Granitic rock that has a plagioclase to total feldspar ratio less than 0.1. QAPF field 2.

LeMaitre et al. 2002

Rhyolitoid in which the ratio of plagioclase to total feldspar is less than 0.1. QAPF field 2.

LeMaitre et al. 2002

Alkali feldspar syenitic rock that contains 0-5 percent quartz and no feldspathoid in the QAPF fraction. QAPF field 6.

LeMaitre et al. 2002

Syenitoid with a plagioclase to total feldspar ratio of less than 0.1. QAPF fields 6, 6*, and 6'.

LeMaitre et al. 2002

• gsrm:Alkali_Feldspar_Syenite ^c
• gsrm:Foid_Bearing_Alkali_Feldspar_Syenite ^c
• gsrm:Quartz_Alkali_Feldspar_Syenite ^c

Trachytoid that has a plagioclase to total feldspar ratio less than 0.1, between 0 and 5 percent quartz in the QAPF fraction, and no feldspathoid minerals. QAPF field 6.

LeMaitre et al. 2002

Trachytoid that has a plagioclase to total feldspar ratio less than 0.1. QAPF fields 6, 6', and 6*.

LeMaitre et al. 2002

• gsrm:Alkali_Feldspar_Trachyte ^c
• gsrm:Foid_Bearing_Alkali_Feldspar_Trachyte ^c
• gsrm:Quartz_Alkali_Feldspar_Trachyte ^c

Metamorphic rock mainly consisting of green, brown or black amphibole and plagioclase (including albite), which combined form 75 percent or more of the rock, and both of which are present as major constituents. The amphibole constitutes 50 percent or more of the total mafic constituents and is present in an amount of 30 percent or more; other common minerals include quartz, clinopyroxene, garnet, epidote-group minerals, biotite, titanite and scapolite.

Coutinho et al. 2007, IUGS SCMR chapter 8 (http://www.bgs.ac.uk/SCMR/)

• Fine-grained igneous rock with less than 20 percent quartz and less than 10 percent feldspathoid minerals in the QAPF fraction, in which the ratio of plagioclase to total feldspar is greater 0.65. Includes rocks defined modally in QAPF fields 9 and 10 or chemically in TAS field O2 as andesite. Basalt and andesite, which share the same QAPF fields, are distinguished chemically based on silica content, with basalt defined to contain less than 52 weight percent silica. If chemical data are not available, the color index is used to distinguish the categories, with basalt defined to contain greater than 35 percent mafic minerals by volume or greater than 40 percent mafic minerals by weight. Typically consists of plagioclase (frequently zoned from labradorite to oligoclase), pyroxene, hornblende and/or biotite. Fine grained equivalent of dioritic rock.

• Note the mela-andesite and leuco-basalt categories are not recommended in this system. If chemical analytical data are available to constrain the silica content, the basalt or andesite category should be used.

after LeMaitre et al. 2002

• gsrm:Fine_Grained_Igneous_Rock ^c
• gsrm:Intermediate_Composition_Igneous_Rock ^c

Anorthositic rock that contains between 0 and 5 percent quartz and no feldspathoid mineral in the QAPF fraction. QAPF field 10.

LeMaitre et al. 2002

• Anorthositic rock term invented to label the combined QAPF fields 10, 10*, and 10', in order to construct hierarchy in this vocabulary.

• Leucocratic phaneritic crystalline igneous rock consisting essentially of plagioclase, often with small amounts of pyroxene. By definition, colour index M is less than 10, and plagiclase to total feldspar ratio is greater than 0.9. Less than 20 percent quartz and less than 10 percent feldspathoid in the QAPF fraction. QAPF field 10, 10*, and 10'.

LeMaitre et al. 2002; This vocabulary

• gsrm:Anorthosite ^c
• gsrm:Foid_Bearing_Anorthosite ^c
• gsrm:Quartz_Anorthosite ^c

Coal that has vitrinite mean random reflectance greater than 2.0% (determined in conformance with ISO 7404-5). Less than 12-14 percent volatiles (dry, ash free), greater than 91 percent fixed carbon (dry, ash free basis). The highest rank coal; very hard, glossy, black, with semimetallic luster, semi conchoidal fracture.

Economic commission for Europe, committee on Sustainable Energy- United Nations (ECE-UN), 1998, International Classification of in-Seam Coals: Energy 19, 41 pp; see also Neuendorf et al. 2005; http://en.wikipedia.org/wiki/Coal#Types_of_coal; Eberhard Lindner; Chemie für Ingenieure; Lindner Verlag Karlsruhe, S. 258

Material known to have artificial (human-related) origin; insufficient information to classify in more detail.

This vocabulary

Unconsolidated material known to have artificial (human-related) origin.

This vocabulary

• gsrm:Anthropogenic_Material ^c
• gsrm:Unconsolidated_Material ^c

Rock that is too fine grained to categorize in more detail.

This vocabulary

Light coloured crystalline rock, characterized by a fine grained allotriomorphic-granular (aplitic, saccharoidal or xenomorphic) texture; typically granitic composition, consisting of quartz, alkali feldspar and sodic plagioclase.

Neuendorf et al. 2005

Clastic sandstone that contains less than 10 percent matrix. Matrix is mud-size silicate minerals (clay, feldspar, quartz, rock fragments, and alteration products) of detrital or diagenetic nature.

Pettijohn, Potter, Siever, 1972, Sand and Sandstone: New York, Springer Verlag, 681 p.

A weakly metamorphosed argillaceous rock (Flawn, 1953, AAPG Bull v37 p.563-664). Rock is very fine-grained to aphanitic, compact, indurated, and massive (lacks fissility or cleavage) (Neuendorf et al, 2004). Claystone and Siltstone are related, non-metamorphosed sedimentary rocks. Like Aphanite but sedimentary protolith is determined. In contact metamorphic environments would be Hornfels.

Neuendorf et al, 2004, provisional SMR 2020-06-11

Tephra in which less than 25 percent of fragments are greater than 64 mm in longest dimension

Schmid 1981; LeMaitre et al. 2002

Tephra in which more than 25 percent of particles are greater than 64 mm in largest dimension. Includes ash breccia, bomb tephra and block tephra of Gillespie and Styles (1999)

Schmid 1981; LeMaitre et al. 2002

Pyroclastic rock in which less than 25 percent of rock by volume are more than 64 mm in longest diameter. Includes tuff, lapilli tuff, and lapillistone.

Schmid 1981; LeMaitre et al. 2002

Fine-grained or porphyritic igneous rock with less than 20 percent quartz, and less than 10 percent feldspathoid minerals, in which the ratio of plagioclase to total feldspar is greater 0.65. Typically composed of calcic plagioclase and clinopyroxene; phenocrysts typically include one or more of calcic plagioclase, clinopyroxene, orthopyroxene, and olivine. Includes rocks defined modally in QAPF fields 9 and 10 or chemically in TAS field B as basalt. Basalt and andesite are distinguished chemically based on silica content, with basalt defined to contain less than 52 weight percent silica. If chemical data are not available, the color index is used to distinguish the categories, with basalt defined to contain greater than 35 percent mafic minerals by volume or greater than 40 percent mafic minerals by weight.

after LeMaitre et al. 2002

• gsrm:Basic_Igneous_Rock ^c
• gsrm:Fine_Grained_Igneous_Rock ^c

• gsrm:Alkali-Olivine_Basalt ^c
• gsrm:Tholeiitic_Basalt ^c

Tephritoid that has a plagioclase to total feldspar ratio greater than 0.9, and contains more than 10 percent normative (CIPW) olivine.

LeMaitre et al. 2002

Foiditoid that contains less than 90 percent feldspathoid minerals in the QAPF fraction, and has a plagioclase to total feldspar ratio that is greater than 0.5, with greater than 10 percent normative olivine.

LeMaitre et al. 2002

Igneous material with between 45 and 52 percent SiO2.

after LeMaitre et al. 2002

Igneous rock with between 45 and 52 percent SiO2.

after LeMaitre et al. 2002

• gsrm:Basic_Igneous_Material ^c
• gsrm:Igneous_Rock ^c

• gsrm:Basalt ^c
• gsrm:Gabbroic_Rock ^c

• Corresponding biogenic sedimentary material and biogenic sedimentary rock categories are not included based on the interpretation that biogenic sedimentary rock will be in a different category, e.g. carbonate sedimentary rock or organic rich sedimentary rock.

• Sediment composed of greater than 50 percent material of biogenic origin. Because the biogenic material may be skeletal remains that are not organic, all biogenic sediment is not necessarily organic-rich.

SLTTs 2004

• gsrm:Ooze ^c
• gsrm:Organic_Rich_Sediment ^c

Sedimentary rock that consists of at least 50 percent silicate mineral material, deposited directly by biological processes at the depositional surface, or in particles formed by biological processes within the basin of deposition. Includes radiolarian chert, diatomite, novaculite.

based on NADM SLTT sedimentary; Hallsworth and Knox 1999

Coal that has vitrinite mean random reflectance greater than 0.6% and less than 2.0% (determined in conformance with ISO 7404-5), or has a gross calorific value greater than 24 MJ/kg (determined in conformance with ISO 1928). Hard, black, organic rich sedimentary rock; contains less than 91 percent fixed carbon on a dry, mineral-matter-free basis, and greater than 13-14 percent volatiles (dry, ash free). Formed from the compaction or induration of variously altered plant remains similar to those of peaty deposits.

Economic commission for Europe, committee on Sustainable Energy- United Nations (ECE-UN), 1998, International Classification of in-Seam Coals: Energy 19, 41 pp; see also http://en.wikipedia.org/wiki/Coal#Types_of_coal; Eberhard Lindner; Chemie für Ingenieure; Lindner Verlag Karlsruhe, S. 258

andesitic rock that contains more than 8 percent MgO. Typically consists of phenocrysts of protoenstatite, orthopyroxene, clinopyroxene, and olivine in a glassy base full of crystallites, and exhibits textures characterisitc of rapid crystal growth.

LeMaitre et al. 2002

• gsrm:Andesite ^c
• gsrm:High_Magnesium_Fine_Grained_Igneous_Rock ^c

Sediment containing greater than 30 percent boulder-size particles (greater than 256 mm in diameter)

Wentworth size scale

Sedimentary carbonate rock with preserved biogenic texture, whose original components were bound and encrusted together during deposition by the action of plants and animals during deposition, and remained substantially in the position of growth.

Hallsworth and Knox 1999; SLTTs 2004

Coarse-grained material composed of angular broken rock fragments; the fragments typically have sharp edges and unworn corners. The fragments may be held together by a mineral cement or in a fine-grained matrix, and consolidated or nonconsolidated. Clasts may be of any composition or origin. In sedimentary environments, breccia is used for material that consists entirely of angular fragments, mostly derived from a single source rock body, as in a rock avalanche deposit, and matrix is interpreted to be the product of comminution of clasts during transport. Diamictite or diamicton is used when the material reflects mixing of rock from a variety of sources, some sub angular or subrounded clasts may be present, and matrix is pre-existing fine grained material that is not a direct product of the brecciation/deposition process.

Neuendorf et al. 2005

Carbonate sediment with a calcite (plus aragonite) to dolomite ratio greater than 1 to 1. Includes lime-sediments.

after Hallsworth and Knox 1999

• gsrm:Calcareous_Carbonate_Sedimentary_Material ^c
• gsrm:Carbonate_Sediment ^c

• gsrm:Impure_Calcareous_Carbonate_Sediment ^c
• gsrm:Pure_Calcareous_Carbonate_Sediment ^c

Carbonate sedimentary material of unspecified consolidation state with a calcite (plus aragonite) to dolomite ratio greater than 1 to 1. Includes lime-sediments, limestone and dolomitic limestone.

after Hallsworth and Knox 1999

• gsrm:Calcareous_Carbonate_Sediment ^c
• gsrm:Calcareous_Carbonate_Sedimentary_Rock ^c

Carbonate sedimentary rock with a calcite (plus aragonite) to dolomite ratio greater than 1 to 1. Includes limestone and dolomitic limestone.

SLTTs 2004; Hallsworth and Knox 1999

• gsrm:Calcareous_Carbonate_Sedimentary_Material ^c
• gsrm:Carbonate_Sedimentary_Rock ^c

• gsrm:Impure_Limestone ^c
• gsrm:Limestone ^c

Carbonate sediment composed of less than 25 percent clasts that have a maximum diameter more than 2 mm, and the ratio of sand size to mud size clasts is less than one.

follow pattern used for clastic sand and mud categories, based on SLTTs 2004

• gsrm:Carbonate_Sediment ^c
• gsrm:Mud_Size_Sediment ^c

• Mudstone that consists of greater than 50 percent carbonate minerals of any origin in the mud size fraction.

• Not a subcategory of carbonate sedimentary rock because definition does not specify 'carbonate minerals of intrabasinal origin', but is agnostic on origin of carbonate. Schnurrenberger et al. 2003 point out that it is very difficult (at least in lacustrine rocks) to distinguish chemically precipitated or diagenetic carbonate from primary biogenic carbonate. This distinction between biogenic, detrital, and pedogenic or authigenic carbonate material is thus not a good one to use in a general purpose classification system. Schnurrenberger, D., Russell, J. and Kelts, K., 2003, Classification of lacustrine sediments based on sedimentary components: Journal of Paleolimnology, v.29, p141-154.

This vocabulary

• gsrm:Carbonate_Sedimentary_Rock ^c
• gsrm:Generic_Mudstone ^c

ooze that consists of more than 50 percent carbonate skeletal remains

This vocabulary

• gsrm:Carbonate_Mud ^c
• gsrm:Ooze ^c

Mud size sediment that contains between 10 and 50 percent carbonate minerals in any size fraction. Carbonate origin is not specified.

This vocabulary

• Carbonate-rich mudstone' definition limits carbonate to mud-size fraction to avoid overlap with 'impure carbonate sedimentary rock'. If carbonate minerals are in sand or gravel size fractions, use 'impure carbonate sedimentary rock'. The operational test typically used to identify this category is if the rock fizzes when hydrochloric acid is applied. The '10 percent carbonate' criteria is a fuzzy boundary.

• Mudstone that contains between 10 and 50 percent carbonate minerals in the mud size fraction. Carbonate origin is not specified.

This vocabulary

Sediment in which at least 50 percent of the primary and/or recrystallized constituents are composed of one (or more) of the carbonate minerals calcite, aragonite and dolomite, in particles of intrabasinal origin.

SLTTs 2004

• gsrm:Carbonate_Sedimentary_Material ^c
• gsrm:Sediment ^c

• gsrm:Calcareous_Carbonate_Sediment ^c
• gsrm:Carbonate_Mud ^c
• gsrm:Dolomitic_Sediment ^c
• gsrm:Impure_Carbonate_Sediment ^c
• gsrm:Pure_Carbonate_Sediment ^c

• Sedimentary material in which at least 50 percent of the primary and/or recrystallized constituents are composed of one (or more) of the carbonate minerals calcite, aragonite and dolomite, in particles of intrabasinal origin.

• Should carbonate sedimentary material be considered a kind of chemical sedimentary material? Is biogenic precipitation a chemical sedimentary process?

SLTTs 2004

• gsrm:Calcareous_Carbonate_Sedimentary_Material ^c
• gsrm:Carbonate_Sediment ^c
• gsrm:Carbonate_Sedimentary_Rock ^c
• gsrm:Dolomitic_Or_Magnesian_Sedimentary_Material ^c

• Particularly for fine-grained sedimentary rocks, distinction of 'intrabasinal' versus 'clastic' genesis can be very interpretive. In practice the use of clastic mudstone terminology as opposed to carbonate mudstone terminology may be dermined by a priori knowledge about the rock being categorized. If it is associated with other clastic rocks, the clastic categories will be favored, if with cabonate rocks, the carbonate categories will be favored. Carbonate rock subcatgories are defined on two orthogonal dimensions--mineralogy (calcitic vs. dolomitic vs non-carbonate impurities), and texture. The texture categories used here are those of Dunham (1962), and involve grain size (matrix vs. grains/allochems), fabric (matrix vs. grain supported), and genesis (bound, frame, or fragmental). The textural approach used for carbonate rocks is conceptually incompatible with that used for clastic sedimentary rocks, which is solely grain size or mineralogy based. This leads to problems in the vocabulary for rocks of mixed siliclastic/carbonate mineralogy (grainstone vs. sandstone, carbonate mudstone vs. carbonate rich mudstone, how to accomodate marlstone...).

• Sedimentary rock in which at least 50 percent of the primary and/or recrystallized constituents are composed of one (or more) of the carbonate minerals calcite, aragonite, magnesite or dolomite.

SLTTs 2004

• gsrm:Carbonate_Sedimentary_Material ^c
• gsrm:Sedimentary_Rock ^c

• gsrm:Boundstone ^c
• gsrm:Calcareous_Carbonate_Sedimentary_Rock ^c
• gsrm:Carbonate_Mudstone ^c
• gsrm:Carbonate_Wackestone ^c
• gsrm:Crystalline_Carbonate ^c
• gsrm:Dolomitic_Or_Magnesian_Sedimentary_Rock ^c
• gsrm:Framestone ^c
• gsrm:Grainstone ^c
• gsrm:Impure_Carbonate_Sedimentary_Rock ^c
• gsrm:Packstone ^c
• gsrm:Pure_Carbonate_Sedimentary_Rock ^c

Carbonate sedimentary rock with discernible mud supported depositional texture and containing greater than 10 percent allochems, and constituent particles are of intrabasinal origin. If particles are not intrabasinal, categorization as a mudstone or wackestone should be considered.

Dunham 1962

Igneous rock composed of more than 50 percent modal carbonate minerals.

LeMaitre et al. 2002

Fault-related rock that maintained primary cohesion during deformation, with matrix comprising greater than 10 percent of rock mass; matrix is fine-grained material formed through grain size reduction by fracture as opposed to crystal plastic process that operate in mylonitic rock. Includes cataclasite, protocataclasite and ultracataclasite.

Sibson, 1977; Scholz, 1990; Snoke and Tullis, 1998; Barker, 1998 Appendix II; NADM SLTTm, 2004

• gsrm:Composite_Genesis_Rock ^c
• gsrm:fault_related_material ^c

A generally soft, white, very fine-grained, extremely pure, porous limestone. It forms under marine conditions from the gradual accumulation of skeletal elements from minute planktonic green algae (cocoliths), associated with varying proportions of larger microscopic fragments of bivalves, foraminifera and ostracods. It is common to find flint and chert nodules embedded in chalk.

Sedimentary material that consists of at least 50 percent material produced by inorganic chemical processes within the basin of deposition. Includes inorganic siliceous, carbonate, evaporite, iron-rich, and phosphatic sediment classes.

SLTTs 2004

• gsrm:Evaporite ^c
• gsrm:Iron_Rich_Sedimentary_Material ^c
• gsrm:Sedimentary_Massive_Sulphide ^c
• gsrm:Travertine ^c

• Metamorphic rock characterized by 50 percent or more of combined chlorite, actinolite and epidote. Category for rocks generally named greenschist or greenstone.

• Rock classified as Greenschist is difficult to categorize in the CGI SimpleLithology scheme. This stems in part from the variation in usage and the general fuzzy definition of the term. The definition of greenschist is generally something along the lines of 'metamorphosed rock with a greenish colour, characterized by the presence of actinolite, chlorite and epidote, and containing a planar or linear fabric. The presence or absence of schistose fabric in rocks called 'greenschist' is problematic. The fabric present in many rocks called greenschist is too weak or variably developed to meet the definition of 'schist' per CGI SimpleLithology. Generally if the rock has achieved metamorphic grade such that the term 'gneiss' is applicable, it would not be called greenschist. Thus, 'greenschist' would correspond most closely to a chlorite + actinolite rich 'Foliated metamorphic rock', but if it actually meets the definition of 'Schist' it would be a chlorite + actinolite 'Schist'.

This vocabulary

• Clastic sedimentary rock composed of at least 30 percent rounded to subangular fragments larger than 2 mm in diameter; typically contains finer grained material in interstices between larger fragments. If more than 15 percent of the fine grained matrix is of indeterminant clastic or diagenetic origin and the fabric is matrix supported, may also be categorized as wackestone. If rock has unsorted or poorly sorted texture with a wide range of particle sizes, may also be categorized as diamictite.

• Note this category is equivlanet to category labeled 'Conglomeratic rock in SLTTs (2004), not to the category labeled 'Conglomerate' in that system.

Neuendorf et al. 2005; SLTTs 2004

• gsrm:Clastic_Sedimentary_Rock ^c
• gsrm:Generic_Conglomerate ^c

• Clastic sedimentary rock consisting of less than 30 percent gravel-size (2 mm) particles and with a mud to sand ratio greater than 1.

• Distinction of intrabasinal, diagenetic, or clastic genesis for very fine-grained carbonate minerals is interpretive in many cases. If there is uncertainty on the mudstone category based on intrabasinal vs epiclastic distinction required for clastic sedimentary rock-carbonate sedimentary rock categorization in this system, it is recommended to use the generic_mudstone category. This category is the union of the various fields labeled 'mudstone' with various qualifiers in Folk, 1954, Figure 1a, although Folk's (1954) category labeled 'mudstone' is a much more restricted category. The CGI category is equivalent to category labeled 'Mudrock' in SLTTs (2004), not to the category labeled 'Mudstone' adopted by that system from Folk (1954). Schnurrenberger, D., Russell, J. and Kelts, K., 2003, Classification of lacustrine sediments based on sedimentary components: Journal of Paleolimnology, v.29, p141-154.

Pettijohn et al. 1987 referenced in Hallsworth and Knox 1999.

• gsrm:Clastic_Sedimentary_Rock ^c
• gsrm:Generic_Mudstone ^c

• gsrm:Claystone ^c
• gsrm:Shale ^c
• gsrm:Siltstone ^c

• Clastic sedimentary rock in which less than 30 percent of particles are greater than 2 mm in diameter (gravel) and the sand to mud ratio is at least 1.

• Note this category is equivalent to cagetory labeled 'sandy rock' in SLTTs (2004), not to the much more restricted category labeled 'Sandstone' in that system.

SLTTs 2004; Neuendorf et al. 2005; particle size from Wentworth grade scale

• gsrm:Clastic_Sedimentary_Rock ^c
• gsrm:Generic_Sandstone ^c

• gsrm:Arenite ^c
• gsrm:Wacke ^c

• Choice of 'clastic' is purposful. Other suggested labels for this category include siliciclastic and terrigineous clastic. Siliciclastic is considered too limiting because the category includes rocks that consists clasts of carbonate minerals, e.g. epiclastic detritus eroded from carbonate rock. Terrigineous clastic was considered and rejected first because it is considered redundant, anything that is terrigineous is clastic. Second, it is questionable if clastic sediment derived by submarine processes (fragementation by gravity sliding, faulting, or volcanic activity, with transport by sediment gravity flow or submarine currents) is terrigineous, but it is clastic and is meant to be included in this category.

• Sediment in which at least 50 percent of the constituent particles were derived from erosion, weathering, or mass-wasting of pre-existing earth materials, and transported to the place of deposition by mechanical agents such as water, wind, ice and gravity.

SLTTs 2004; Neuendorf et al. 2005

• gsrm:Clastic_Sedimentary_Material ^c
• gsrm:Sediment ^c

• gsrm:Diamicton ^c
• gsrm:Gravel ^c
• gsrm:Mud ^c
• gsrm:Sand ^c

Sedimentary material of unspecified consolidation state in which at least 50 percent of the constituent particles were derived from erosion, weathering, or mass-wasting of pre-existing earth materials, and transported to the place of deposition by mechanical agents such as water, wind, ice and gravity.

SLTTs 2004; Neuendorf et al. 2005

• gsrm:Clastic_Sediment ^c
• gsrm:Clastic_Sedimentary_Rock ^c

• Sedimentary rock in which at least 50 percent of the constituent particles were derived from erosion, weathering, or mass-wasting of pre-existing earth materials, and transported to the place of deposition by mechanical agents such as water, wind, ice and gravity.

• The conglomerate, sandstone, mudstone, and wackestone categories are not defined as kinds of clastic sedimentary rocks because rocks meeting their purely grainsize based definitions might also be iron-rich, phosphatic, or carbonate. This is based on GeoSciML allowance to assign rocks to more than one lithology category. For example to categorize a rock as a clastic conglomerate requires assignment ot the 'clastic sedimentary rock' category and to the 'conglomerate' category. Particularly for fine-grained sedimentary rocks, distinction of 'intrabasinal' versus 'clastic' genesis can be very interpretive. In practice the use of clastic mudstone terminology as opposed to carbonate mudstone terminology may be dermined by a priori knowledge about the rock being categorized. If it is associated with other clastic rocks, the clastic categories will be favored, if with cabonate rocks, the carbonate categories will be favored.

SLTTs 2004; Neuendorf et al. 2005

• gsrm:Clastic_Sedimentary_Material ^c
• gsrm:Sedimentary_Rock ^c

• gsrm:Clastic_Conglomerate ^c
• gsrm:Clastic_Mudstone ^c
• gsrm:Clastic_Sandstone ^c
• gsrm:Diamictite ^c

Mud that consists of greater than 50 percent particles with grain size less than 0.004 mm

based on SLTTs 2004; Neuendorf et al. 2005; particle size from Wentworth grade scale

Mudstone that contains no detectable silt, inferred to consist virtually entirely of clay-size particles.

This vocabulary

A consolidated organic sedimentary material having less than 75% moisture. This category includes low, medium, and high rank coals according to International Classification of In-Seam Coal (United Nations, 1998), thus including lignite. Sapropelic coal is not distinguished in this category from humic coals. Formed from the compaction or induration of variously altered plant remains similar to those of peaty deposits.

Economic commission for Europe, committee on Sustainable Energy- United Nations (ECE-UN), 1998, International Classification of in-Seam Coals: Energy 19, 41 pp.

• gsrm:Anthracite_Coal ^c
• gsrm:Bituminous_Coal ^c
• gsrm:Lignite ^c

Sediment containing greater than 30 percent cobble-size particles (64-256 mm in diameter)

Wentworth size scale

Material of unspecified consolidation state formed by geological modification of pre-existing materials outside the realm of igneous and sedimentary processes. Includes rocks formed by impact metamorphism, standard dynamothermal metamorphism, brittle deformation, weathering, metasomatism and hydrothermal alteration (diagenesis is a sedimentary process in this context).

SLTTm 2004

• gsrm:Composite_Genesis_Rock ^c
• gsrm:fault_related_material ^c
• gsrm:impact_generated_material ^c
• gsrm:material_formed_in_surficial_environment ^c

Rock formed by geological modification of pre-existing rocks outside the realm of igneous and sedimentary processes. Includes rocks formed by impact metamorphism, standard dynamothermal metamorphism, brittle deformation, weathering, metasomatism and hydrothermal alteration (diagenesis is a sedimentary process in this context).

SLTTm 2004

• gsrm:Composite_Genesis_Material ^c
• gsrm:Rock ^c

• gsrm:Cataclasite_Series ^c
• gsrm:Duricrust ^c
• gsrm:Metamorphic_Rock ^c
• gsrm:Metasomatic_Rock ^c

GeoSciML v4

A property that specifies the degree to which an aggregation of EarthMaterial particles is a distinct solid material. Consolidation and induration are related concepts specified by this property. They define a continuum from unconsolidated material to very hard rock. Induration is the degree to which a consolidated material is made hard, operationally determined by how difficult it is to break a piece of the material. Consolidated materials may have varying degrees of induration (NADMSC, 2004)

• gsoc:isQualityOfonly
  
• gsoc:isQualityOf exactly 1
  

• gsrm:any_consolidation ^c
• gsrm:consolidated ^c
• gsrm:consolidation_variable ^c
• gsrm:unconsolidated ^c

Carbonate rock of indeterminate mineralogy in which diagenetic processes have obliterated any original depositional texture.

SLTTs 2004

Fine grained or porphyritic crystalline rock that contains less than 90 percent mafic minerals, between 20 and 60 percent quartz in the QAPF fraction, and has a plagioclase to total feldspar ratio greater than 0.65. Includes rocks defined modally in QAPF fields 4 and 5 or chemically in TAS Field O3. Typically composed of quartz and sodic plagioclase with minor amounts of biotite and/or hornblende and/or pyroxene; fine-grained equivalent of granodiorite and tonalite.

LeMaitre et al. 2002

• gsrm:Acidic_Igneous_Rock ^c
• gsrm:Fine_Grained_Igneous_Rock ^c

Unsorted or poorly sorted, clastic sedimentary rock with a wide range of particle sizes including a muddy matrix. Biogenic materials that have such texture are excluded. Distinguished from conglomerate, sandstone, mudstone based on polymodality and lack of structures related to transport and deposition of sediment by moving air or water. If more than 10 percent of the fine grained matrix is of indeterminant clastic or diagenetic origin and the fabric is matrix supported, may also be categorized as wacke.

Fairbridge and Bourgeois 1978

• Unsorted or poorly sorted, clastic sediment with a wide range of particle sizes, including a muddy matrix. Biogenic materials that have such texture are excluded. Distinguished from conglomerate, sandstone, mudstone based on polymodality and lack of structures related to transport and deposition of sediment by moving air or water. Assignment to an other size class can be used in conjunction to indicate the dominant grain size.

• definition amplified to help distinguish diamicton, conglomerate and wackestone in this version

Fairbridge and Bourgeois 1978

Phaneritic crystalline rock consisting of intermediate plagioclase, commonly with hornblende and often with biotite or augite; colour index M less than 90, sodic plagioclase (An0-An50), no feldspathoid, and between 0 and 5 percent quartz. Includes rocks defined modally in QAPF field 10 as diorite.

LeMaitre et al. 2002

Phaneritic crystalline rock with M less than 90, consisting of intermediate plagioclase, commonly with hornblende and often with biotite or augite. A dioritoid with a plagioclase to total feldspar ratio (in the QAPF fraction) greater than 0.9. Includes rocks defined modally in QAPF fields 10, 10' and 10*.

LeMaitre et al. 2002

• gsrm:Diorite ^c
• gsrm:Foid_Bearing_Diorite ^c
• gsrm:Quartz_Diorite ^c

Phaneritic crystalline igneous rock with M less than 90, consisting of intermediate plagioclase, commonly with hornblende and often with biotite or augite. Plagioclase to total feldspar ratio is greater that 0.65, and anorthite content of plagioclase is less than 50 percent. Less than 10 percent feldspathoid mineral and less than 20 percent quartz in the QAPF fraction. Includes rocks defined modally in QAPF fields 9 and 10 (and their subdivisions).

LeMaitre et al. 2002

• gsrm:Intermediate_Composition_Igneous_Rock ^c
• gsrm:Phaneritic_Igneous_Rock ^c

• gsrm:Dioritic_Rock ^c
• gsrm:Monzodioritic_Rock ^c

Dark colored gabbroic (basaltic) or dioritic (andesitic) rock intermediate in grain size between basalt and gabbro and composed of plagioclase, pyroxene and opaque minerals; often with ophitic texture. Typically occurs as hypabyssal intrusions. Includes dolerite, microdiorite, diabase and microgabbro.

Neuendorf et al 2005; LeMaitre et al. 2002; Gillespie and Styles 1999

Carbonate sedimentary material of unspecified consolidation degree with a ratio of magnesium carbonate to calcite (plus aragonite) greater than 1 to 1. Includes dolomite sediment, dolostone, lime dolostone and magnesite-stone.

after SLTTs 2004, Hallsworth and Knox 1999

• gsrm:Dolomitic_Or_Magnesian_Sedimentary_Rock ^c
• gsrm:Dolomitic_Sediment ^c

Carbonate sedimentary rock with a ratio of magnesium carbonate to calcite (plus aragonite) greater than 1 to 1. Includes dolostone, lime dolostone and magnesite-stone.

after SLTTs 2004, Hallsworth and Knox 1999

• gsrm:Carbonate_Sedimentary_Rock ^c
• gsrm:Dolomitic_Or_Magnesian_Sedimentary_Material ^c

• gsrm:Dolostone ^c
• gsrm:Impure_Dolostone ^c

Carbonate sediment with a ratio of magnesium carbonate to calcite (plus aragonite) greater than 1 to 1.

after SLTTs 2004, Hallsworth and Knox 1999

• gsrm:Carbonate_Sediment ^c
• gsrm:Dolomitic_Or_Magnesian_Sedimentary_Material ^c

• gsrm:Impure_Dolomitic_Sediment ^c
• gsrm:Pure_Dolomitic_Sediment ^c

Pure carbonate sedimentary rock with a ratio of magnesium carbonate to calcite (plus aragonite) greater than 1 to 1.

This vocabulary

• gsrm:Dolomitic_Or_Magnesian_Sedimentary_Rock ^c
• gsrm:Pure_Carbonate_Sedimentary_Rock ^c

Rock forming a hard crust or layer at or near the Earth's surface at the time of formation, e.g. in the upper horizons of a soil, characterized by structures indicative of pedogenic origin.

This vocabulary

• gsrm:Composite_Genesis_Rock ^c
• gsrm:material_formed_in_surficial_environment ^c

Metamorphic rock composed of 75 percent or more (by volume) omphacite and garnet, both of which are present as major constituents, the amount of neither of them being higher than 75 percent (by volume); the presence of plagioclase precludes classification as an eclogite.

IUGS SCMR 2007 (http://www.bgs.ac.uk/SCMR/)

Nonclastic sedimentary rock composed of at least 50 percent non-carbonate salts, including chloride, sulfate or borate minerals; formed through precipitation of mineral salts from a saline solution (non-carbonate salt rock).

Jackson 1997; SLTTs 2004

• gsrm:Exotic_Evaporite ^c
• gsrm:Rock_Gypsum_Or_Anhydrite ^c
• gsrm:Rock_Salt ^c

Kimberlite, lamproite, or lamprophyre. Generally are potassic, mafic or ultramafic rocks. Olivine (commonly serpentinized in kimberlite), and phlogopite are significant constituents.

based on LeMaitre et al. 2002

Rock with 'exotic' mineralogical, textural or field setting characteristics; typically dark colored, with abundant phenocrysts. Criteria include: presence of greater than 10 percent melilite or leucite, or presence of kalsilite, or greater than 50 percent carbonate minerals. Includes Carbonatite, Melilitic rock, Kalsilitic rocks, Kimberlite, Lamproite, Leucitic rock and Lamprophyres.

Gillespie and Styles 1999; LeMaitre et al. 2002

• gsrm:Carbonatite ^c
• gsrm:Exotic_Alkaline_Rock ^c
• gsrm:Kalsilitic_And_Melilitic_Rock ^c

• Category represents evaporite material that is not mostly gypsum/anhydrite or halite. These are generally not very common, thus the 'exotic' name

• Evaporite that is not 50 percent halite or 50 percent gypsum or anhydrite.

This vocabulary

• Igneous rock in which the framework of the rock consists of crystals that are too small to determine mineralogy with the unaided eye; framework may include up to 50 percent glass. A significant percentage of the rock by volume may be phenocrysts. Includes rocks that are generally called volcanic rocks.

• Need to make decision as to whether devitrified glass should be considered glass or microcrystalline framework for purposes of categorization

Gillespie and Styles 1999; LeMaitre et al. 2002

• gsrm:Andesite ^c
• gsrm:Basalt ^c
• gsrm:Dacite ^c
• gsrm:Foiditoid ^c
• gsrm:High_Magnesium_Fine_Grained_Igneous_Rock ^c
• gsrm:Phonolitoid ^c
• gsrm:Rhyolitoid ^c
• gsrm:Tephritoid ^c
• gsrm:Trachytoid ^c

Alkali feldspar syenitic rock that contains 0-10 percent feldspathoid mineral and no quartz in the QAPF fraction. QAPF field 6'.

LeMaitre et al. 2002

Alkali feldspar trachytic rock that contains no quartz and between 0 and 10 percent feldspathoid mineral in the QAPF fraction. QAPF field 6'.

LeMaitre et al. 2002

Anorthositic rock that contains between 0 and 10 percent feldspathoid mineral and no quartz in the QAPF fraction. QAPF field 10'.

LeMaitre et al. 2002

Dioritic rock that contains between 0 and 10 percent feldspathoid minerals in the QAPF fraction. QAPF field 10'.

LeMaitre et al. 2002

Gabbroic rock that contains 0-10 percent feldspathoid minerals and no quartz in the QAPF fraction. QAPF field 10'.

LeMaitre et al. 2002

Latitic rock that contains no quartz and between 0 and 10 percent feldspathoid minerals in the QAPF fraction. QAPF field 8'.

LeMaitre et al. 2002

Monzodioritic rock that contains between 0 and 10 percent feldspathoid mineral.

LeMaitre et al. 2002

Monzogabbroic rock that contains 0 to 10 percent feldspathoid mineral in the QAPF fraction. QAPF field 9'.

LeMaitre et al. 2002

Monzonitic rock that contains 0-10 percent feldspathoid mineral and no quartz in the QAPF fraction. Includes rocks defined modally in QAPF Field 8'.

LeMaitre et al. 2002

Syenitic rock that contains between 0 and 10 percent feldspathoid mineral and no quartz in the QAPF fraction. Defined modally in QAPF Field 7'.

LeMaitre et al. 2002

Trachytic rock that contains between 0 and 10 percent feldspathoid in the QAPF fraction, and no quartz. QAPF field 7'.

LeMaitre et al. 2002

Foid dioritoid in which the plagioclase to total feldspar ratio is greater than 0.9. Includes rocks defined modally in QAPF field 14.

LeMaitre et al. 2002

Phaneritic crystalline igneous rock in which M is less than 90, the plagioclase to total feldspar ratio is greater than 0.5, feldspathoid minerals form 10-60 percent of the QAPF fraction, plagioclase has anorthite content less than 50 percent. These rocks typically contain large amounts of mafic minerals. Includes rocks defined modally in QAPF fields 13 and 14.

LeMaitre et al. 2002

• gsrm:Foid_Diorite ^c
• gsrm:Foid_Monzodiorite ^c

Foid gabbroid that has a plagioclase to total feldspar ratio greater than 0.9. Includes rocks defined modally in QAPF field 14.

LeMaitre et al. 2002

Phaneritic crystalline igneous rock in which M is less than 90, the plagioclase to total feldspar ratio is greater than 0.5, feldspathoids form 10-60 percent of the QAPF fraction, and plagioclase has anorthite content greater than 50 percent. These rocks typically contain large amounts of mafic minerals. Includes rocks defined modally in QAPF fields 13 and 14.

LeMaitre et al. 2002

• gsrm:Foid_Gabbro ^c
• gsrm:Foid_Monzogabbro ^c

Foid dioritoid in which the plagioclase to total feldspar ratio is between 0.1 and 0.9. Includes rocks defined modally in QAPF field 13.

LeMaitre et al. 2002

Foid gabbroid that has a plagioclase to total feldspar ratio between 0.5 and 0.9. Includes rocks defined modally in QAPF field 13.

LeMaitre et al. 2002

Foid syenitoid rock that has a plagioclase to total feldspar ratio of between 0.1 and 0.5. Includes rocks defined modally in QAPF Field 12.

LeMaitre et al. 2002

Foid syenitoid that has a plagioclase to total feldspar ratio of less than 0.1. Includes rocks defined modally in QAPF field 11.

LeMaitre et al. 2002

Phaneritic crystalline igneous rock with M less than 90, contains between 10 and 60 percent feldspathoid mineral in the QAPF fraction, and has a plagioclase to total feldspar ratio less than 0.5. Includes QAPF fields 11 and 12.

LeMaitre et al. 2002

• gsrm:Foid_Monzosyenite ^c
• gsrm:Foid_Syenite ^c

Foiditoid that contains greater than 90 percent feldspathoid minerals in the QAPF fraction.

LeMaitre et al. 2002

Fine grained crystalline rock containing less than 90 percent mafic minerals and more than 60 percent feldspathoid minerals in the QAPF fraction. Includes rocks defined modally in QAPF field 15 or chemically in TAS field F.

LeMaitre et al. 2002

• gsrm:Basanitic_Foidite ^c
• gsrm:Foidite ^c
• gsrm:Phonolitic_Foidite ^c
• gsrm:Tephritic_Foidite ^c

Phaneritic crystalline rock containing more than 60 percent feldspathoid minerals in the QAPF fraction. Includes rocks defined modally in QAPF field 15

LeMaitre et al. 2002

Metamorphic rock in which 10 percent or more of the contained mineral grains are elements in a planar or linear fabric. Cataclastic or glassy character precludes classification with this concept.

based on NADM SLTT metamorphic

• gsrm:Gneiss ^c
• gsrm:Mylonitic_Rock ^c
• gsrm:Phyllite ^c
• gsrm:Schist ^c
• gsrm:Slate ^c

igneous_material of unspecified consolidation state in which greater than 75 percent of the rock consists of fragments produced as a result of igneous rock-forming process.

CGI concept definition task group

• gsrm:Fragmental_Igneous_Rock ^c
• gsrm:Pyroclastic_Material ^c

Igneous rock in which greater than 75 percent of the rock consists of fragments produced as a result of igneous rock-forming process. Includes pyroclastic rocks, autobreccia associated with lava flows and intrusive breccias. Excludes deposits reworked by epiclastic processes (see Tuffite)

This vocabulary

• gsrm:Fragmental_Igneous_Material ^c
• gsrm:Igneous_Rock ^c

Carbonate reef rock consisting of a rigid framework of colonies, shells or skeletons, with internal cavities filled with fine sediment; usually created through the activities of colonial organisms.

Hallsworth and Knox 1999; SLTTs 2004, Table 15-3-1

• Gabbroic rock that contains between 0 and 5 percent quartz and no feldspathoid mineral in the QAPF fraction. Includes rocks defined modally in QAPF Field 10 as gabbro.

• Note that this category includes gabbro (sensu stricto) of LeMaitre et al. 2002, but is broader, including the other rock types defined by orthopyroxene-clinopyroxene-olivine-hornblende mineral ratios.

LeMaitre et al. 2002

Gabbroid that has a plagioclase to total feldspar ratio greater than 0.9 in the QAPF fraction. Includes QAPF fields 10*, 10, and 10'. This category includes the various categories defined in LeMaitre et al. (2002) based on the mafic mineralogy, but apparently not subdivided based on the quartz/feldspathoid content.

LeMaitre et al. 2002

• gsrm:Basic_Igneous_Rock ^c
• gsrm:Gabbroid ^c

• gsrm:Foid_Bearing_Gabbro ^c
• gsrm:Gabbro ^c
• gsrm:Quartz_Gabbro ^c

Phaneritic crystalline igneous rock that contains less than 90 percent mafic minerals, and up to 20 percent quartz or up to 10 percent feldspathoid in the QAPF fraction. The ratio of plagioclase to total feldspar is greater than 0.65, and anorthite content of the plagioclase is greater than 50 percent. Includes rocks defined modally in QAPF fields 9 and 10 and their subdivisions.

LeMaitre et al. 2002

• gsrm:Gabbroic_Rock ^c
• gsrm:Monzogabbroic_Rock ^c

Sedimentary rock composed of at least 30 percent rounded to subangular fragments larger than 2 mm in diameter; typically contains finer grained material in interstices between larger fragments. If more than 15 percent of the fine grained matrix is of indeterminant clastic or diagenetic origin and the fabric is matrix supported, may also be categorized as wackestone. If rock has unsorted or poorly sorted texture with a wide range of particle sizes, may also be categorized as diamictite.

Neuendorf et al. 2005; SLTTs 2004; particle sizes defined from Krumbein phi scale (W C Krumbein and L L Sloss, Stratigraphy and Sedimentation, 2nd edition, Freeman, San Francisco, 1963; Krumbein and Pettijohn, 1938, Manual of Sedimentary Petrography: New York, Appleton Century Co., Inc.)

• Distinction of intrabasinal, diagenetic, or clastic genesis for very fine-grained carbonate minerals is so interpretive that it is proposed to not define the mudstone category based on intrabasinal vs epiclastic distinction required for clastic sedimentary rock-carbonate sedimentary rock categorization in this system. Schnurrenberger, D., Russell, J. and Kelts, K., 2003, Classification of lacustrine sediments based on sedimentary components: Journal of Paleolimnology, v.29, p141-154.

• Sedimentary rock consisting of less than 30 percent gravel-size (2 mm) particles and with a mud to sand ratio greater than 1. Clasts may be of any composition or origin.

Pettijohn et al. 1987 referenced in Hallsworth and Knox 1999; extrapolated from Folk, 1954, Figure 1a; particle sizes defined from Krumbein phi scale (W C Krumbein and L L Sloss, Stratigraphy and Sedimentation, 2nd edition, Freeman, San Francisco, 1963; Krumbein and Pettijohn, 1938, Manual of Sedimentary Petrography: New York, Appleton Century Co., Inc.)

• gsrm:Carbonate_Mudstone ^c
• gsrm:Carbonate_Rich_Mudstone ^c
• gsrm:Clastic_Mudstone ^c
• gsrm:Organic_Bearing_Mudstone ^c
• gsrm:Pure_Carbonate_Mudstone ^c
• gsrm:Silicate_Mudstone ^c

Sedimentary rock in which less than 30 percent of particles are greater than 2 mm in diameter (gravel) and the sand to mud ratio is at least 1.

SLTTs 2004; Neuendorf et al. 2005; particle sizes defined from Krumbein phi scale (W C Krumbein and L L Sloss, Stratigraphy and Sedimentation, 2nd edition, Freeman, San Francisco, 1963; Krumbein and Pettijohn, 1938, Manual of Sedimentary Petrography: New York, Appleton Century Co., Inc.)

Igneous rock that contains greater than 50 percent massive glass.

This vocabulary, based on Gillespie and Styles 1999

• Igneous rock that consists of greater than 80 percent massive glass.

• Note that this category is used for massive glassy rocks. Much of the pyroclastic material in a pyroclastic rock may be composed of glass, but the rock is named based on its fragmental nature.

This vocabulary

• A metamorphic rock of roughly basaltic composition, defined by the presence of glaucophane with lawsonite or epidote. Other minerals that may be present include jadeite, albite, chlorite, garnet, and muscovite (phengitic white mica). Typically fine-grained, dark colored. Category for rocks commonly referred to as blueschist.

• Fabric is weakly developed in this rock in many cases, so the fabric categories 'foliated metamorphic rock, 'schist' or 'granofels' may apply.

This vocabulary

Foliated metamorphic rock with bands or lenticles rich in granular minerals alternating with bands or lenticles rich in minerals with a flaky or elongate prismatic habit. Mylonitic foliation or well developed, continuous schistosity (greater than 50 percent of the rock consists of grains participate in a planar or linear fabric) precludes classification with this concept.

Neuendorf et al. 2005

• gsrm:Orthogneiss ^c
• gsrm:Paragneiss ^c

Carbonate sedimentary rock with recognizable depositional fabric that is grain-supported, and constituent particles are of intrabasinal origin; contains little or no mud matrix. Distinction from sandstone is based on interpretation of intrabasinal origin of clasts and grain-supported fabric, but grainstone definition does not include a grain size criteria.

Dunham 1962

Phaneritic crystalline rock consisting of quartz, alkali feldspar and plagioclase (typically sodic) in variable amounts, usually with biotite and/or hornblende. Includes rocks defined modally in QAPF Field 3.

LeMaitre et al. 2002

• gsrm:Monzogranite ^c
• gsrm:Syenogranite ^c

Phaneritic crystalline igneous rock consisting of quartz, alkali feldspar and/or plagioclase. Includes rocks defined modally in QAPF fields 2, 3, 4 and 5 as alkali feldspar granite, granite, granodiorite or tonalite.

LeMaitre et al. 2002

• gsrm:Acidic_Igneous_Rock ^c
• gsrm:Phaneritic_Igneous_Rock ^c

• gsrm:Alkali_Feldspar_Granite ^c
• gsrm:Granite ^c
• gsrm:Granodiorite ^c
• gsrm:Tonalite ^c

Phaneritic crystalline rock consisting essentially of quartz, sodic plagioclase and lesser amounts of alkali feldspar with minor hornblende and biotite. Includes rocks defined modally in QAPF field 4.

LeMaitre et al. 2002

Metamorphic rock with granoblastic fabric and very little or no foliation (less than 10 percent of the mineral grains in the rock are elements in a planar or linear fabric). Grainsize not specified.

SLTTm 2004

• Metamorphic rock of high metamorphic grade in which Fe-Mg silicate minerals are dominantly hydroxl-free; feldspar must be present, and muscovite is absent; rock contains less than 90 percent mafic minerals, less than 75 percent calcite and/or dolomite, less than 75 percent quartz, less than 50 percent iron-bearing minerals (hematite, magnetite, limonite-group, siderite, iron-sulfides), and less than 50 percent calc-silicate minerals.

• Wimmenauer (1985) requires granulite to consist of at least 20 percent feldspar. Garnet is frequently present; some hornblende or biotite may be present. The rock has a granoblastic texture and gneissose to massive structure; grain size and fabric may be variable on a decimetric scale. Foliation is less well developed than in rock that would typically be called gneiss. The minerals present in a granulite vary depending on the protolith and the temperature and pressure conditions experienced during metamorphism. According to Fettes and Desmons (2007) the main calc-silicate minerals are calcic garnet, calcic plagioclase, calcic scapolite, diopside-hedenbergite, epidote group minerals, hydrogrossular, johannsenite, prehnite, pumpellyite, titanite, vesuvianite, wollastonite. Note that the shale and siltstone categories may apply to any of the mineralogically defined mudstone categories.

Fettes and Desmons (2007). See also Wimmenauer (1985), Winkler (1979) (D.R. Bowes (1989), The Encyclopedia of Igneous and Metamorphic Petrology; Van Nostrand Reinhold ISBN: 0-442-20623-2 ; wikipedia, http://en.wikipedia.org/wiki/Granulite accessed 5/30/09

Clastic sediment containing greater than 30 percent gravel-size particles (greater than 2.0 mm diameter). Gravel in which more than half of the particles are of epiclastic origin

definition of gravel from SLTTs 2004; particle sizes defined from Krumbein phi scale (W C Krumbein and L L Sloss, Stratigraphy and Sedimentation, 2nd edition, Freeman, San Francisco, 1963; Krumbein and Pettijohn, 1938, Manual of Sedimentary Petrography: New York, Appleton Century Co., Inc.)

• gsrm:Clastic_Sediment ^c
• gsrm:Gravel_Size_Sediment ^c

Sediment containing greater than 30 percent gravel-size particles (greater than 2.0 mm diameter). Composition or gensis of clasts not specified.

SLTTs 2004; particle sizes defined from Krumbein phi scale (W C Krumbein and L L Sloss, Stratigraphy and Sedimentation, 2nd edition, Freeman, San Francisco, 1963; Krumbein and Pettijohn, 1938, Manual of Sedimentary Petrography: New York, Appleton Century Co., Inc.)

• gsrm:Boulder_Gravel_Size_Sediment ^c
• gsrm:Cobble_Gravel_Size_Sediment ^c
• gsrm:Gravel ^c
• gsrm:Pebble_Gravel_Size_Sediment ^c

fine-grained igneous rock that contains unusually high concentration of MgO. For rocks that contain greater than 52 percent silica, MgO must be greater than 8 percent. For rocks containing less than 52 percent silica, MgO must be greater than 12 percent.

LeMaitre et al. 2002

• gsrm:Boninite ^c
• gsrm:Komatiitic_Rock ^c

Ultramafic rock that consists of greater than 40 percent hornblende plus pyroxene and has a hornblende to pyroxene ratio greater than 1. Includes olivine hornblendite, olivine-pyroxene hornblendite, pyroxene hornblendite, and hornblendite.

LeMaitre et al. 2002

• gsrm:Phaneritic_Igneous_Rock ^c
• gsrm:Ultramafic_Igneous_Rock ^c

Granofels formed by contact metamorphism, composed of a mosaic of equidimensional grains in a characteristically granoblastic or decussate matrix; porphyroblasts or relict phenocrysts may be present. Typically fine grained.

IUGS SCMR 2007 (http://www.bgs.ac.uk/SCMR/)

Sediment that does not fit any of the other sediment composition/genesis categories. Sediment consisting of three or more components which form more than 5 percent but less than 50 precent of the material.

Hallsworth and Knox, 1999

Sedimentary rock that does not fit any of the other composition/genesis categories. Sedimentary rock consisting of three or more components which form more than 5 percent but less than 50 precent of the material.

Hallsworth and Knox, 1999

Rock consisting of greater that 50% sulphide or sulfosalt minerals formed by hydrothermal mineralization processes {@en}.

provisional by SMR 2020-06-07

• gsrm:Massive_Sulphide ^c
• gsrm:Metasomatic_Rock ^c

Igneous rocks formed by crystallisation close to the Earth's surface, characterized by more rapid cooling than plutonic setting to produce generally fine-grained intrusive igneous rock, commonly associated with co-magmatic volcanic rocks.

This vocabulary

Earth material formed as a result of igneous processes, eg. intrusion and cooling of magma in the crust, volcanic eruption.

This vocabulary

• gsrm:Acidic_Igneous_Material ^c
• gsrm:Basic_Igneous_Material ^c
• gsrm:Fragmental_Igneous_Material ^c
• gsrm:Igneous_Rock ^c
• gsrm:Intermediate_Composition_Igneous_Material ^c

rock formed as a result of igneous processes, for example intrusion and cooling of magma in the crust, or volcanic eruption.

Neuendorf et al 2005

• gsrm:Igneous_Material ^c
• gsrm:Rock ^c

• gsrm:Acidic_Igneous_Rock ^c
• gsrm:Basic_Igneous_Rock ^c
• gsrm:Doleritic_Rock ^c
• gsrm:Exotic_Composition_Igneous_Rock ^c
• gsrm:Fine_Grained_Igneous_Rock ^c
• gsrm:Fragmental_Igneous_Rock ^c
• gsrm:Glass_Rich_Igneous_Rock ^c
• gsrm:Hypabyssal_Intrusive_Rock ^c
• gsrm:Intermediate_Composition_Igneous_Rock ^c
• gsrm:Phaneritic_Igneous_Rock ^c
• gsrm:Plutonic_Igneous_Rock ^c
• gsrm:Porphyry ^c
• gsrm:Ultrabasic_Igneous_Rock ^c
• gsrm:Ultramafic_Igneous_Rock ^c

Carbonate sediment in which between 50 and 90 percent of the constituents are composed of one (or more) of the carbonate minerals in particles of intrabasinal origin, and a calcite (plus aragonite) to dolomite ratio greater than 1 to 1.

This vocabulary

• gsrm:Calcareous_Carbonate_Sediment ^c
• gsrm:Impure_Carbonate_Sediment ^c

Carbonate sediment in which between 50 and 90 percent of the constituents are composed of one (or more) of the carbonate minerals in particles of intrabasinal origin.

This vocabulary

• gsrm:Impure_Calcareous_Carbonate_Sediment ^c
• gsrm:Impure_Dolomitic_Sediment ^c

Sedimentary rock in which between 50 and 90 percent of the primary and/or recrystallized constituents are composed of carbonate minerals.

This vocabulary

• gsrm:Impure_Dolostone ^c
• gsrm:Impure_Limestone ^c

Carbonate sediment in which between 50 and 90 percent of the constituents are composed of one (or more) of the carbonate minerals in particles of intrabasinal origin, and the ratio of magnesium carbonate to calcite (plus aragonite) greater than 1 to 1.

This vocabulary

• gsrm:Dolomitic_Sediment ^c
• gsrm:Impure_Carbonate_Sediment ^c

Impure carbonate sedimentary rock with a ratio of magnesium carbonate to calcite (plus aragonite) greater than 1 to 1.

This vocabulary

• gsrm:Dolomitic_Or_Magnesian_Sedimentary_Rock ^c
• gsrm:Impure_Carbonate_Sedimentary_Rock ^c

Impure carbonate sedimentary rock with a calcite (plus aragonite) to dolomite ratio greater than 1 to 1.

This vocabulary

• gsrm:Calcareous_Carbonate_Sedimentary_Rock ^c
• gsrm:Impure_Carbonate_Sedimentary_Rock ^c

Igneous material with between 52 and 63 percent SiO2.

after LeMaitre et al. 2002

Igneous rock with between 52 and 63 percent SiO2.

after LeMaitre et al. 2002

• gsrm:Igneous_Rock ^c
• gsrm:Intermediate_Composition_Igneous_Material ^c

• gsrm:Andesite ^c
• gsrm:Dioritoid ^c

Sediment that consists of at least 50 percent iron-bearing minerals (hematite, magnetite, limonite-group, siderite, iron-sulfides), as determined by hand-lens or petrographic analysis. Corresponds to a rock typically containing 15 percent iron by weight.

SLTTs 2004

• gsrm:Iron_Rich_Sedimentary_Material ^c
• gsrm:Sediment ^c

Sedimentary material of unspecified consolidation state that consists of at least 50 percent iron-bearing minerals (hematite, magnetite, limonite-group, siderite, iron-sulfides), as determined by hand-lens or petrographic analysis. Corresponds to a rock typically containing 15 percent iron by weight.

SLTTs 2004

• gsrm:Iron_Rich_Sediment ^c
• gsrm:Iron_Rich_Sedimentary_Rock ^c

Sedimentary rock that consists of at least 50 percent iron-bearing minerals (hematite, magnetite, limonite-group, siderite, iron-sulfides), as determined by hand-lens or petrographic analysis. Corresponds to a rock typically containing 15 percent iron by weight.

Hallsworth and Knox 1999; SLTTs 2004

• gsrm:Iron_Rich_Sedimentary_Material ^c
• gsrm:Sedimentary_Rock ^c

Igneous rock containing greater than 10 percent melilite or kalsilite. Typically undersaturated, ultrapotassic (kalsilitic rocks) or calcium-rich (melilitic rocks) mafic or ultramafic rocks.

based on LeMaitre et al. 2002

Ultramafic, magnesium-rich volcanic rock, typically with spinifex texture of intergrown skeletal and bladed olivine and pyroxene crystals set in abundant glass. Includes komatiite and meimechite.

LeMaitre et al. 2002

• gsrm:High_Magnesium_Fine_Grained_Igneous_Rock ^c
• gsrm:Ultramafic_Igneous_Rock ^c

Latitic rock that contains between 0 and 5 percent quartz and no feldspathoid in the QAPF fraction. QAPF field 8.

LeMaitre et al. 2002

Trachytoid that has a plagioclase to total feldspar ratio between 0.35 and 0.65. QAPF fields 8, 8' and 8*.

LeMaitre et al. 2002

• gsrm:Foid_Bearing_Latite ^c
• gsrm:Latite ^c
• gsrm:Quartz_Latite ^c

Coal that has a gross calorific value less than 24 MJ/kg (determined in conformance with ISO 1928), and vitrinite mean random reflectance less than 0.6% (determined in conformance with ISO 7404-5). Gross calorific value is recalculated to a moist, ash free basis using bed moisture (determined according to ISO 1015 or ISO 5068). Includes all low-rank coals, including sub-bitiminous coal. A consolidated, dull, soft brown to black coal having many readily discernible plant fragments set in a finer grained organic matrix. Tends to crack and fall apart on drying. Operationally sub-bituminous and bitiminous coal are qualitatively distinguished based on brown streak for sub-bitiminous coal and black streak for bituminous coal.

Economic commission for Europe, committee on Sustainable Energy- United Nations (ECE-UN), 1998, International Classification of in-Seam Coals: Energy 19, 41 pp.

Pure carbonate sedimentary rock with a calcite (plus aragonite) to dolomite ratio greater than 1 to 1. Includes limestone and dolomitic limestone.

This vocabulary

• gsrm:Calcareous_Carbonate_Sedimentary_Rock ^c
• gsrm:Pure_Carbonate_Sedimentary_Rock ^c

• gsrm:Chalk ^c
• gsrm:Travertine ^c

Metamorphic rock consisting of greater than 75 percent fine- to coarse-grained recrystallized calcite and/or dolomite; usually with a granoblastic, saccharoidal texture.

IUGS SCMR 2007 (http://www.bgs.ac.uk/SCMR/), SLTTm1.0 2004

rock consisting of greater than 50% sulphide or sulfosalt minerals formed by any processes. Includes hydrothermal and sedimentary ehalative sulfide.

Provisional SMR 2020-06-07

• gsrm:Hydrothermal_Massive_Sulphide ^c
• gsrm:Sedimentary_Massive_Sulphide ^c

• Robertson (1999, Classification of metamorphic rocks: British Geological Survey Research Report, RR 99–02) defines the boundary between diagenesis and metamorphism in sedimentary rocks as follows: “…the boundary between diagenesis and metamorphism is somewhat arbitrary and strongly dependent on the lithologies involved. For example changes take place in organic materials at lower temperatures than in rocks dominated by silicate minerals. In mudrocks, a white mica (illite) crystallinity value of less than 0.42 Delta 2 Theta obtained by X-ray diffraction analysis, is used to define the onset of metamorphism (Kisch, 1991). In this scheme, the first appearance of glaucophane, lawsonite, paragonite, prehnite, pumpellyite or stilpnomelane is taken to indicate the lower limit of metamorphism (Frey and Kisch, 1987; Bucher and Frey, 1994; Frey and Robinson, 1998). Most workers agree that such mineral growth starts at 150 +/- 50° C in silicate rocks. Many lithologies may show no change in mineralogy under these conditions and hence the recognition of the onset of metamorphism will vary with bulk composition.”

• Rock formed by solid-state mineralogical, chemical and/or structural changes to a pre-existing rock, in response to marked changes in temperature, pressure, shearing stress and chemical environment.

Jackson 1997

• gsrm:Amphibolite ^c
• gsrm:Argillite ^c
• gsrm:Chlorite_Actinolite_Epidote_Metamorphic_Rock ^c
• gsrm:Eclogite ^c
• gsrm:Foliated_Metamorphic_Rock ^c
• gsrm:Glaucophane_Lawsonite_Epidote_Metamorphic_Rock ^c
• gsrm:Granofels ^c
• gsrm:Granulite ^c
• gsrm:Marble ^c
• gsrm:Metaplutonic_Rock ^c
• gsrm:Metasedimentary_Rock ^c
• gsrm:Metavolcanic_Rock ^c
• gsrm:Migmatite ^c
• gsrm:Quartzite ^c
• gsrm:Serpentinite ^c

Rock formed by metamorphism of a plutonic igneous protolith.

This vocabulary

Rock formed by metamorphism of a sedimentary protolith.

This vocabulary

• Rock that has fabric and composition indicating open-system mineralogical and chemical changes in response to interaction with a fluid phase, typically water rich.

• SLTTm (2004) proposed the following criteria to distinguish hydrothermally altered or metasomatic rock from igneous rock. "The rock is classified as metamorphic if (1) the texture has been modified such that it can no longer be considered igneous, (2) the bulk composition of the rock is inconsistent with compositions that can be derived purely from a magma and associated processes such as assimilation and differentiation, or (3) minerals inconsistent with magmatic crystallization are present."

This vocabulary

• gsrm:Hydrothermal_Massive_Sulphide ^c
• gsrm:Skarn ^c
• gsrm:Spilite ^c
• gsrm:altered_rock ^c
• gsrm:not_altered_rock ^c

Rock formed by metamorphism of an extrusive igneous protolith.

This vocabulary

• A schist that consists of more than 50 percent mica minerals, typically muscovite or biotite. Special type included to distinguish this common variety of schist.

• Include single subcategory of schist to indicate this common kind of schist. 'Mica rich metamorphic rock' for compound use with schist fabric term would be more compatible with treatment of blueschist (Glaucophane lawsonite epidote metamorphic rock) and greenschist (Chlorite actinolite epidote metamorphic rock), but based on the assumption that schist is the only rock type that will meet the mica-rich criteria, it seems reasonable to include as a subtype of schist.

This vocabulary

Silicate metamorphic rock that is pervasively heterogeneous on a decimeter to meter scale that typically consists of darker and lighter parts; the darker parts usually exhibit features of metamorphic rocks whereas the lighter parts are of igneous-looking appearance.

Fette and Desmons (2007) (http://www.bgs.ac.uk/SCMR/)

Phaneritic crystalline igneous rock consisting of sodic plagioclase (An0 to An50), alkali feldspar, hornblende and biotite, with or without pyroxene, and 0 to 5 percent quartz. Includes rocks defined modally in QAPF field 9.

LeMaitre et al. 2002

Phaneritic crystalline igneous rock consisting of sodic plagioclase (An0 to An50), alkali feldspar, hornblende and biotite, with or without pyroxene, and 0 to 10 percent feldspathoid or 0 to 20 percent quartz in the QAPF fraction. Plagioclase to total feldspar ratio in the QAPF fraction is between 0.65 and 0.9. Includes rocks defined modally in QAPF field 9, 9' and 9* as monzodiorite, foid-beaing monzodiorite, and quartz monzodiorite.

This vocabulary; LeMaitre et al. 2002

• gsrm:Foid_Bearing_Monzodiorite ^c
• gsrm:Monzodiorite ^c
• gsrm:Quartz_Monzodiorite ^c

Monzogabbroic rock that contains between 0 an 5 percent quartz and no feldspathoid mineral in the QAPF fraction. Includes rocks defined modally in QAPF field 9 .

LeMaitre et al. 2002, This vocabulary

Gabbroid with a plagioclase to total feldspar ratio between 0.65 and 0.9. QAPF field 9, 9 prime and 9 asterisk

LeMaitre et al. 2002, This vocabulary

• gsrm:Foid_Bearing_Monzogabbro ^c
• gsrm:Monzogabbro ^c
• gsrm:Quartz_Monzogabbro ^c

Granite that has a plagiolcase to total feldspar ratio between 0.35 and 0.65. QAPF field 3b.

LeMaitre et al. 2002

Monzonitic rock that contains 0-5 percent quartz and no feldspathoid mineral in the QAPF fraction. Includes rocks defined modally in QAPF Field 8.

LeMaitre et al. 2002

Syenitoid with a plagioclase to total feldspar ratio between 0.35 and 0.65. Includes rocks in QAPF fields 8, 8*, and 8'.

LeMaitre et al. 2002

• gsrm:Foid_Bearing_Monzonite ^c
• gsrm:Monzonite ^c
• gsrm:Quartz_Monzonite ^c

Clastic sediment consisting of less than 30 percent gravel-size (2 mm) particles and with a mud-size to sand-size particle ratio greater than 1. More than half of the particles are of epiclastic origin.

definition of mud from SLTTs 2004 muddy sediment; particle sizes defined from Krumbein phi scale (W C Krumbein and L L Sloss, Stratigraphy and Sedimentation, 2nd edition, Freeman, San Francisco, 1963; Krumbein and Pettijohn, 1938, Manual of Sedimentary Petrography: New York, Appleton Century Co., Inc.)

• gsrm:Clastic_Sediment ^c
• gsrm:Mud_Size_Sediment ^c

• gsrm:Clay ^c
• gsrm:Silt ^c

Sediment consisting of less than 30 percent gravel-size (2 mm) particles and with a mud-size to sand-size particle ratio greater than 1. Clasts may be of any composition or origin.

based on SLTTs 2004; Neuendorf et al. 2005; particle sizes defined from Krumbein phi scale (W C Krumbein and L L Sloss, Stratigraphy and Sedimentation, 2nd edition, Freeman, San Francisco, 1963; Krumbein and Pettijohn, 1938, Manual of Sedimentary Petrography: New York, Appleton Century Co., Inc.)

• gsrm:Carbonate_Mud ^c
• gsrm:Carbonate_Rich_Mud ^c
• gsrm:Mud ^c
• gsrm:Ooze ^c
• gsrm:Silicate_Mud ^c

Metamorphic rock characterised by a foliation resulting from tectonic grain size reduction, in which more than 10 percent of the rock volume has undergone grain size reduction. Includes protomylonite, mylonite, ultramylonite, and blastomylonite.

Marshak and Mitra 1988

• gsrm:Foliated_Metamorphic_Rock ^c
• gsrm:fault_related_material ^c

Unconsolidated material known to have natural, ie. not human-made, origin.

This vocabulary

• gsrm:Sediment ^c
• gsrm:Tephra ^c

Sediment that consists of at least 50 percent silicate mineral material, deposited directly by chemical or biological processes at the depositional surface, or in particles formed by chemical or biological processes within the basin of deposition.

NGMDB 2008; Hallsworth and Knox 1999

• gsrm:Non_Clastic_Siliceous_Sedimentary_Material ^c
• gsrm:Sediment ^c

Sedimentary material that consists of at least 50 percent silicate mineral material, deposited directly by chemical or biological processes at the depositional surface, or in particles formed by chemical or biological processes within the basin of deposition.

SLTTs 2004

• gsrm:Non_Clastic_Siliceous_Sediment ^c
• gsrm:Non_Clastic_Siliceous_Sedimentary_Rock ^c

• Definition updated to include chert, flint SMR 2020-09-21

• Sedimentary rock that consists of at least 50 percent silicate mineral material, deposited directly by chemical or biological processes at the depositional surface, in particles formed by chemical or biological processes within the basin of deposition, or formed by diagenetic processes. Includes chert and flint found in carbonate rocks.

modified from SLTTs 2004

• gsrm:Non_Clastic_Siliceous_Sedimentary_Material ^c
• gsrm:Sedimentary_Rock ^c

• Biogenic sediment consisting of less than 1 percent gravel-size (greater than or equal to 2 mm) particles, with a sand to mud ratio less than 1 to 9, and less than 50 percent carbonate minerals.

• Neuendorf et al. 2005 put cutoff at 30 percent skeletal remains; this is raised to 50 percent in This vocabulary for consistency with definition of other Biogenic sediment category

based on Bates and Jackson 1987 and Hallsworth and Knox 1999

• gsrm:Biogenic_Sediment ^c
• gsrm:Mud_Size_Sediment ^c

• gsrm:Carbonate_Ooze ^c
• gsrm:Siliceous_Ooze ^c

Mudstone that contains a significant amount of organic carbon, typically kerogen. commonly finely laminated, brown or black in color.

Neuendorf et al. 2005; http://en.wikipedia.org/wiki/Oil_shale

• Sediment with color, composition, texture and apparent density indicating greater than 50 percent organic content by weight on a moisture-free basis.

• The broader relation from organic rich sediment to biogenic sediment is based on the inference that organic rich material is always biogenic in origin. Biogenic is a broader category because not all biogenic materials are organic rich, for example shells or phosphatic bone.

SLTTs 2004

• gsrm:Biogenic_Sediment ^c
• gsrm:Organic_Rich_Sedimentary_Material ^c

• gsrm:Peat ^c
• gsrm:Sapropel ^c

Sedimentary material in which 50 percent or more of the primary sedimentary material is organic carbon.

SLTTs 2004

• gsrm:Organic_Rich_Sediment ^c
• gsrm:Organic_Rich_Sedimentary_Rock ^c

• Sapropelic coal, and asphaltite are not differentiated in This vocabulary

• Sedimentary rock with color, composition, texture and apparent density indicating greater than 50 percent organic content by weight on a moisture-free basis.

SLTTs 2004

• gsrm:Organic_Rich_Sedimentary_Material ^c
• gsrm:Sedimentary_Rock ^c

A gneiss with mineralogy and texture indicating derivation from a phaneritic igneous rock protolith. Typically consists of abundant feldspar, with quartz, and variable hornblende, biotite, and muscovite, with a relatively homogeneous character.

This vocabulary

• Carbonate sedimentary rock with discernible grain supported depositional texture, containing greater than 10 percent grains, and constituent particles are of intrabasinal origin; intergranular spaces are filled by matrix.

• Note that this category overlaps with 'carbonate mudstone'.

Hallsworth and Knox 1999

A gneiss with mineralogy and texture indicating derivation from a sedimentary rock protolith. Typically consists of abundant quartz, mica, or calcsilicate minerals; aluminosilicate minerals or garnet commonly present. composition of rock tends to be more variable on a decimetric scale that in orthogneiss.

This vocabulary

Unconsolidated organic-rich sediment composed of at least 50 percent semi-carbonised plant remains; individual remains commonly seen with unaided eye; yellowish brown to brownish black; generally fibrous texture; can be plastic or friable. In its natural state it can be readily cut and has a very high moisture content, generally greater than 90 percent. Liptinite to Inertinite ratio is less than one (Economic commission for Europe, committee on Sustainable Energy- United Nations (ECE-UN), 1998, International Classification of in-Seam Coals: Energy 19, 41 pp.)

Hallsworth and Knox 1999

Sediment containing greater than 30 percent pebble-size particles (2.0 -64 mm in diameter)

Wentworth size scale

Exceptionally coarse grained crystalline rock with interlocking crystals; most grains are 1cm or more diameter; composition is generally that of granite, but the term may refer to the coarse grained facies of any type of igneous rock;usually found as irregular dikes, lenses, or veins associated with plutons or batholiths.

Neuendorf et al. 2005

Ultramafic rock consisting of more than 40 percent (by volume) olivine with pyroxene and/or amphibole and little or no feldspar. commonly altered to serpentinite. Includes rocks defined modally in the ultramafic rock classification as dunite, harzburgite, lherzolite, wehrlite, olivinite, pyroxene peridotite, pyroxene hornblende peridotite or hornblende peridotite.

LeMaitre et al. 2002

• gsrm:Phaneritic_Igneous_Rock ^c
• gsrm:Ultramafic_Igneous_Rock ^c

Igneous rock in which the framework of the rock consists of individual crystals that can be discerned with the unaided eye. Bounding grain size is on the order of 32 to 100 microns. Igneous rocks with 'exotic' composition are excluded from this concept.

Neuendorf et al. 2005

• gsrm:Anorthositic_Rock ^c
• gsrm:Aplite ^c
• gsrm:Dioritoid ^c
• gsrm:Foid_Dioritoid ^c
• gsrm:Foid_Gabbroid ^c
• gsrm:Foid_Syenitoid ^c
• gsrm:Foidolite ^c
• gsrm:Gabbroid ^c
• gsrm:Granitoid ^c
• gsrm:Hornblendite ^c
• gsrm:Pegmatite ^c
• gsrm:Peridotite ^c
• gsrm:Pyroxenite ^c
• gsrm:Quartz_Rich_Igneous_Rock ^c
• gsrm:Syenitoid ^c

Phonolitoid in which the plagioclase to total feldspar ratio is less than 0.1. Rock consists of alkali feldspar, feldspathoid minerals, and mafic minerals.

LeMaitre et al. 2002

Tephritoid that has a plagioclase to total feldspar ratio between 0.5 and 0.9, and contains more than 10 percent normative (CIPW) olivine.

LeMaitre et al. 2002

Foiditoid that contains less than 90 percent feldspathoid minerals in the QAPF fraction, and has a plagioclase to total feldspar ratio that is less than 0.5

LeMaitre et al. 2002

Tephritoid that has a plagioclase to total feldspar ratio between 0.5 and 0.9, and contains less than 10 percent normative (CIPW) olivine.

LeMaitre et al. 2002

Fine grained igneous rock than contains less than 90 percent mafic minerals, between 10 and 60 percent feldspathoid mineral in the QAPF fraction and has a plagioclase to total feldspar ratio less than 0.5. Includes rocks defined modally in QAPF fields 11 and 12, and TAS field Ph.

LeMaitre et al. 2002

• gsrm:Phonolilte ^c
• gsrm:Tephritic_Phonolite ^c

Sediment in which at least 50 percent of the primary and/or recrystallized constituents are phosphate minerals.

SLTTs 2004

• gsrm:Phosphate_Rich_Sedimentary_Material ^c
• gsrm:Sediment ^c

Sedimentary material in which at least 50 percent of the primary and/or recrystallized constituents are phosphate minerals.

SLTTs 2004

• gsrm:Phosphate_Rich_Sediment ^c
• gsrm:Phosphorite ^c

Sedimentary rock in which at least 50 percent of the primary or recrystallized constituents are phosphate minerals. Most commonly occurs as a bedded primary or reworked secondary marine rock, composed of microcrystalline carbonate fluorapatite in the form of lamina, pellets, oolites and nodules, and skeletal, shell and bone fragments.

HallsworthandKnox 1999, Jackson 1997

• gsrm:Phosphate_Rich_Sedimentary_Material ^c
• gsrm:Sedimentary_Rock ^c

Rock with a well developed, continuous schistosity, an average grain size between 0.1 and 0.5 millimeters, and a silvery sheen on cleavage surfaces. Individual phyllosilicate grains are barely visible with the unaided eye.

IUGS SCMR 2007 (http://www.bgs.ac.uk/SCMR/)

Mylonitic rock composed largely of fine-grained mica that imparts a sheen to foliation surfaces; may have flaser lamination, isoclinal folding, and deformed veins, which indicate significant shearing. Macroscopically resembles phyllite, but formed by mechanical degradation of initially coarser rock.

NADM metamorphic rock vocabulary SLTTm1.0; Marshak and Mitra 1988

Instrusive igneous rock formed by crystallisation of magma far enough below Earth surface that complete crystallization of magma bodies forms holocrystalline medium to coarse grained igneous rock, wall rocks generally do not include volcanic products related to the magma, and some contact metamorphism is tyypically developed at intrusive contacts.

This vocabulary

Igneous rock that contains conspicuous phenocrysts in a finer grained groundmass; groundmass itself may be phaneritic or fine-grained.

LeMaitre et al. 2002

Carbonate sediment in which greater than 90 percent of the constituents are composed of one (or more) of the carbonate minerals in particles of intrabasinal origin, and a calcite (plus aragonite) to dolomite ratio greater than 1 to 1.

This vocabulary

• gsrm:Calcareous_Carbonate_Sediment ^c
• gsrm:Pure_Carbonate_Sediment ^c

Mudstone that consists of greater than 90 percent carbonate minerals of intrabasinal orign in the mud fraction, and contains less than 10 percent allochems. The original depositional texture is preserved and fabric is matrix supported. Carbonate mudstone of Dunham (1962)

Dunham 1962

• gsrm:Generic_Mudstone ^c
• gsrm:Pure_Carbonate_Sedimentary_Rock ^c

Carbonate sediment in which greater than 90 percent of the constituents are composed of one (or more) of the carbonate minerals in particles of intrabasinal origin.

This vocabulary

• gsrm:Pure_Calcareous_Carbonate_Sediment ^c
• gsrm:Pure_Dolomitic_Sediment ^c

Sedimentary rock in which greater than 90 percent of the primary and/or recrystallized constituents are carbonate minerals.

This vocabulary

• gsrm:Dolostone ^c
• gsrm:Limestone ^c
• gsrm:Pure_Carbonate_Mudstone ^c

Carbonate sediment in which greater than 90 percent of the constituents are composed of one (or more) of the carbonate minerals in particles of intrabasinal origin, and a ratio of magnesium carbonate to calcite (plus aragonite) greater than 1 to 1.

This vocabulary

• gsrm:Dolomitic_Sediment ^c
• gsrm:Pure_Carbonate_Sediment ^c

Fragmental igneous material that consists of more than 75 percent of particles formed by disruption as a direct result of volcanic action.

LeMaitre et al. 2002

• gsrm:Pyroclastic_Rock ^c
• gsrm:Tephra ^c

Fragmental igneous rock that consists of greater than 75 percent fragments produced as a direct result of eruption or extrusion of magma from within the earth onto its surface. Includes autobreccia associated with lava flows and excludes deposits reworked by epiclastic processes.

based on LeMaitre et al. 2002

• gsrm:Fragmental_Igneous_Rock ^c
• gsrm:Pyroclastic_Material ^c

• gsrm:Ash_Tuff_Lapillistone_And_Lapilli_Tuff ^c
• gsrm:Tuff_Breccia_Agglomerate_Or_Pyroclastic_Breccia ^c

Ultramafic phaneritic igneous rock composed almost entirely of one or more pyroxenes and occasionally biotite, hornblende and olivine. Includes rocks defined modally in the ultramafic rock classification as olivine pyroxenite, olivine-hornblende pyroxenite, pyroxenite, orthopyroxenite, clinopyroxenite and websterite.

LeMaitre et al. 2002

• gsrm:Phaneritic_Igneous_Rock ^c
• gsrm:Ultramafic_Igneous_Rock ^c

Alkali feldspar syenitic rock that contains 5 to 20 percent quartz and no feldspathoid in the QAPF fraction. QAPF field 6*.

LeMaitre et al. 2002

Alkali feldspar trachytic rock that contains and between 5 and 20 percent quartz mineral in the QAPF fraction. QAPF field 6*.

LeMaitre et al. 2002

Anorthositic rock that contains between 5 and 20 percent quartz in the QAPF fraction. QAPF field 10*.

LeMaitre et al. 2002

Dioritic rock that contains between 5 to 20 percent quartz in the QAPF fraction. QAPF field 10*.

LeMaitre et al. 2002

Gabbroic rock that contains between 5 and 20 percent quartz in the QAPF fraction. QAPF field 10*.

LeMaitre et al. 2002

Latitic rock that contains between 5 and 20 percent quartz in the QAPF fraction. QAPF field 8*.

LeMaitre et al. 2002

Monzodioritic rock that contains between 5 and 20 percent quartz.

LeMaitre et al. 2002

Monzogabbroic rock that contains between 5 and 20 percent quartz in the QAPF fraction. QAPF field 9*.

LeMaitre et al. 2002

Monzonitic rock that contains 5-20 percent quartz iin the QAPF fraction. Includes rocks defined modally in QAPF Field 8*.

LeMaitre et al. 2002

• Occurrence of igneous rocks meeting this criteria seems to be vanishingly rare, thus subdividing the category does not seem warranted for the purposes of This vocabulary. Future usage of the vocabulary may motivate including quatzolite and quartz-rich granitoid in future revisions

• Phaneritic crystalline igneous rock that contains less than 90 percent mafic minerals and contains greater than 60 percent quartz in the QAPF fraction.

Gillespie and Styles 1999; LeMaitre et al. 2002

• gsrm:Acidic_Igneous_Rock ^c
• gsrm:Phaneritic_Igneous_Rock ^c

Syenitic rock that contains between 5 and 20 percent quartz in the QAPF fraction. Defined modally in QAPF Field 7*.

LeMaitre et al. 2002

Trachytic rock that contains between 5 and 20 percent quartz in the QAPF fraction. QAPF field 7*.

LeMaitre et al. 2002

Metamorphic rock consisting of greater than or equal to 75 percent quartz; typically granoblastic texture.

after Neuendorf et al. 2005

rhyolitoid in which the ratio of plagioclase to total feldspar is between 0.1 and 0.65.

LeMaitre et al. 2002

• Note that technical definition, based on modal mineralogy plotted in a QAPF triangle may be applied qualitatively, based on phenocryst mineralogy when ground mass mineralogy can not be determined optically, or based on CIPW norm. Although TAS categories are defined based on chemical analyses, the correspondence with the QAPF defined categories is generally close enough that QAPF categories are commonly used interchangeably with TAS categories. It is important to note the basis for assignment of fine-grained igneous rocks to a specifice lithology category.

• fine_grained_igneous_rock consisting of quartz and alkali feldspar, with minor plagioclase and biotite, in a microcrystalline, cryptocrystalline or glassy groundmass. Flow texture is common. Includes rocks defined modally in QAPF fields 2 and 3 or chemically in TAS Field R as rhyolite. QAPF normative definition is based on modal mineralogy thus: less than 90 percent mafic minerals, between 20 and 60 percent quartz in the QAPF fraction, and ratio of plagioclse to total feldspar is less than 0.65.

LeMaitre et al. 2002

• gsrm:Acidic_Igneous_Rock ^c
• gsrm:Fine_Grained_Igneous_Rock ^c

• gsrm:Alkali_Feldspar_Rhyolite ^c
• gsrm:Rhyolite ^c

Consolidated aggregate of one or more EarthMaterials, or a body of undifferentiated mineral matter, or of solid organic material. Includes mineral aggregates such as granite, shale, marble; glassy matter such as obsidian; and organic material such a coal. Excludes unconsolidated materials.

Jackson, 1997; NADM C1 2004; Neuendorf et al 2005

• gsrm:Aphanite ^c
• gsrm:Composite_Genesis_Rock ^c
• gsrm:Igneous_Rock ^c
• gsrm:Massive_Sulphide ^c
• gsrm:Sedimentary_Rock ^c
• gsrm:Tuffite ^c