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Sedimentary Rocks
Rocks formed when sediment (pieces of broken shells, rocks,
mineral grains and other material) gathers in layers.
Detrital Rocks
-
made of grains of
minerals or other
rocks that have
moved and been
deposited in layers
and cemented
together by pressure
and other minerals.
-
categorized by size of
mineral grain: clay <
silt < sand < pebble
-
examples: shale,
siltstone, sandstone,
and conglomerate
Chemical Rocks
Organic Rocks
-formed when mineral-rich
water evaporates and leaves
behind a deposit of the
mineral
- formed from the remains
of living matter (takes
millions of years)
-example: halite
- fossils can be found in
some organic rocks
- examples: coal, limestone,
and chalk
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