EARTH SCIENCE LAB
Sedimentary Sample #3:


Identify the Texture, Grain Size, Composition and Rock Type

Image of Sedimentary Sample #3

     

Sedimentary Rock Identification Chart
TEXTURE GRAIN SIZE COMPOSITION ROCK NAME
Clastic >2 mm rounded quartz, feldspar and rock fragments Conglomerate
>2 mm angular quartz, feldspar and rock fragments Breccia
1/16 - 2 mm quartz, feldspar Sandstone
>1/16 mm feldspar, quartz Arkose
<1/16 mm quartz, clay minerals Siltstone
     (Mudstone, Shale)
<1/256 mm quartz, clay minerals Claystone
Chemical no grain size silica (quartz) Chert
dolomite Dolostone
calcite Limestone
halite Rock Salt
gypsum Rock Gypsum
Biologic no grain size silica (quartz) Chert
loosely compacted organic material
     and plant fragments
Peat
densely compacted organic material
     and plant fragments
Bituminous Coal
calcite Limestone
calcite, micro-skeletal fragments Chalk
calcite, almost entirely shell
     and skeletal fragments
Coquina
calcite with some shell
     and skeletal fragments
Fossiliferous Limestone
dolomite with some shell
     and skeletal fragments
Fossiliferous Dolostone

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