A clastic sedimentary rock

Grain size is anywhere from 60 micrometers to 2 millimeters

Made from sand grains that are cemented together

Sand makes up at least half of the composition

Layered

Made of mostly quartz grains, but occasionally feldspar, other minerals and rock fragments

Is the most common sedimentary rock because it is made of quartz and feldspar, which are the most common minerals in the Earth's crust

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A clastic sedimentary rock

Made of mud and clay (sediment with grains size less than 4 micrometers)

Can be easily split into thin sheets or slabs

Layered

Extremely fine grained and soft

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A chemical or organic sedimentary rock

Microscopic to very coarse grain size

Composed of mostly calcite

Fizzes in acid

Shell limestone is organic sedimentary rock formed by the accumulation of shells of dead microscopic organisms

Dolomite limestone is chemical sedimentary rock formed by deposits of minerals left behind as water runs through caves

 Shell limestone may have fossils in it

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A clastic sedimentary rock

Made of pebbles (gravel), cobblestones, and/or boulders cemented in sand, silt or clay

Rounded and/or smooth clasts

Clasts are poorly cemented together

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An organic sedimentary rock

Formed from the remains of dead plants that have been morphed under heat and pressure for millions of years

Used as fossil fuel

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