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The rock type table

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In the following table you can find the content of the earth materials (rock types) catalog contained in wwhypda.
The USCS code represents the Unified Soil Classification System code.
In the description you can find an external link to a more detailed description of the rock material.

NOTE: Would you like to add an earth material that is not present in the catalog or you disagree with the classification method we have adopted? Tell us!

name description USCS code
Anhydrite Anhydrous calcium sulfate mineral found in salt deposits. more info...
Basalt Dark, fine-graided volcanic rock composed mainly of calcic plagioclase feldspars and pyroxene. more info...
Basalt, vesicular Basalt with small cavities formed by the expansion of bubbles of gas or steam. more info...
Basalt, weathered Basalt altered by weathering. more info...
Chalk Soft, white, porous form of limestone composed of the mineral calcite. more info...
Clay Aggregate of hydrous silicate particles less than 2 micrometres in diameter. more info... C
Clay, high plasticity Clay of high plasticity, fat clay. more info... CH
Clay, inorganic Inorganic clay. more info... CL
Clay, kaolinite Kaolinite clay. more info...
Clay, organic Organic clay. more info...
Clay, organic, high plasticity Organic clay, high plasticity. more info... OH
Clay, organic, low plasticity Organic clay, low plasticity. more info... OL
Clay, sandy Clay that contains a significant proportion of sand. more info...
Coal Coal is formed from plant remains that have been compacted, hardened, chemically altered, and metamorphosed. more info...
Coal, spoil Coal spoil. more info...
Dolomite Sedimentary rock composed largely of calcium magnesium carbonate. more info...
Dolomite, weathered Weathered dolomite. more info...
Gabbro Dark, coarse-grained, intrusive igneous rock chemically equivalent to basalt. more info...
Gabbro, weathered Wheathered gabbro. more info...
Gneiss Coarsely foliated and largely recristalized metamorphic rock. more info...
Granite Coarse grained igneous rock composed of more than 20% of quartz and feldspar. more info...
Granite, weathered Weathered granite. more info...
Gravel Sediment with grain size larger than sand (2 mm). more info... G
Gravel, clayey Clayey gravel. more info... GC
Gravel, clean poorly graded Clean poorly graded gravel. more info... GP
Gravel, clean well graded Clean well graded gravel, fine to coarse gravel. more info... GW
Gravel, coarse Gravel with grains between 16 mm and 32 mm. more info...
Gravel, fine Grains between 4 mm and 8 mm. more info...
Gravel, medium Grains between 8 mm and 16 mm. more info...
Gravel, sandy Gravel with a significant proportion of sand. more info...
Gravel, silty Silty gravel. more info... GM
Gravel, with silty sand Gravel with silty sand. more info...
Lignite Brown coal. more info...
Limestone Sedimentary rock composed largely of calcium carbonate. more info...
Limestone, karstic Karstic limestone. more info...
Loam Soil composed of a relatively even mixture sand, silt, and clay. more info...
Loess Fine and silty eolian type of soil. more info...
Marl Muds or mudstones rich in calcium carbonate or lime. more info...
Marl, flood Flood marls. more info...
Marl, flood plain Flood plain marl. more info...
Marl, levee Levee marl. more info...
Peat Accumulation of partially decayed vegetation matter. more info... PT
Peridotite Dense, coarse-grained rock, consisting mostly of the minerals olivine and pyroxene. more info...
Sand Rock grains of 0.0625 to 2 mm diameter. more info... S
Sand, clayey Sand with 10 to 20% of clay. more info... SC
Sand, clean poorly graded Clean poorly graded sand. more info... SP
Sand, clean well graded Clean well graded sand, fine to coarse sand. more info... SW
Sand, coarse Grains between 1 mm and 4 mm. more info...
Sand, eolian Eolian sand. more info...
Sand, fine Grains between 0.0625 mm and 0.25 mm. more info...
Sand, fluvial Fluvial sand. more info...
Sand, gravelly Gravelly sand. more info...
Sand, medium Grains between 0.25 mm and 1 mm. more info...
Sand, silty Silty sand. more info... SM
Sandstone Sedimentary rock composed mainly of sand-size mineral or rock grains. more info...
Sandstone, channel Channel sandstone. more info...
Sandstone, crevasse Crevasse sandstone. more info...
Sandstone, fine Fine sandstone. more info...
Sandstone, levee Levee sandstone. more info...
Sandstone, medium Medium sandstone. more info...
Sandstone, midchannel Midchannel sandstone. more info...
Schist Metamorphic rock exhibiting a foliation produced by deformation. more info...
Shale Fine-grained sedimentary rock whose original constituents were clays or muds. more info...
Shale, weathered Fine-grained sedimentary rock whose original constituents were clays or muds. more info...
Silt Soil or rock particles of small size range (3.9 to 62.5 micrometers). more info... M
Silt, clayey Clayey silt. more info...
Silt, high plasticity Silt of high plasticity, elastic silt. more info...
Silt, inorganic Inorganic silt. more info...
Silt, organic Organic silt. more info...
Silt, organic, high plasticity Organic silt, high plasticity. more info... OH
Silt, organic, low plasticity Organic silt, low plasticity. more info... OL
Silt, sandy Silt that contains a significant proportion of sand. more info...
Siltstone Consolidated sedimentary rock whose grain size is between sandstone and shale. more info...
Till Unsorted glacial sediment. more info...
Tuff Consolidated volcanic ash ejected during a volcanic eruption. more info...

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