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Rock Cycle - Rocks (5A)
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Rock Cycle - Rocks (5A)
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SEDIMENTARY ROCK CLASSIFICATION CHART
CLASTIC SEDIMENTARY ROCKS
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TEXTURE |
ROCK NAME |
MINERAL COMPOSITION |
ROCK NAME IF IT INCLUDES FOSSILS |
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finer than sand < 1/16 mm |
SMOOTH |
MUDSTONE |
Clay |
DIATOMITE (diatoms) |
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GRITTY |
SILTSTONE |
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sand size (1/16 to 2 mm) |
SANDSTONE |
quartz (quartz sandstone) |
FOSSILEROUS SANDSTONE
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rock fragments, feldspar, quartz, mica (greywacke) |
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quartz, feldspar (arkose) |
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coarser than sand >2mm |
rounded grains |
CONGLOMERATE |
quarts, feldspar, rock fragments |
FOSSILEROUS CONGLOMERATE |
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angular grains |
BRECCIA |
FOSSILEROUS BRECCIA |
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CHEMICAL (precipitated) SEDIMENTARY ROCKS
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TEXTURE |
ROCK NAME |
MINERAL COMPOSITION |
WITH FOSSILS |
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microcrystalline |
CHERT |
quartz |
RADIOLARIAN CHERT |
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crystalline |
GYPSUM |
gypsum |
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crystalline |
ROCK SALT |
halite |
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crystalline |
DOLOMITE |
dolomite |
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crystalline |
LITHOGRAPHIC |
calcite |
FOSSILIFEROUS LIMESTONE |
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spongy, crumbly |
COAL |
no true minerals, various stages of altered plant remains |
PEAT |
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spongy brown |
LIGNITE |
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hard, black to brown |
BITUMINOUS |
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hard, shiny dark |
ANTHRACITE |
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