Examples of Foliated Metamorphic Rocks
All three of the following rocks have the same parent rock: a sedimentary rock called shale that forms from mud and clay in environments such as ocean floors and swamps. When shale is metamorphosed to different grades it forms different types of foliated metamorphic rocks.
(click for larger image)
|It looks like shale because it is dark in color and will break into thin
flat layers like shale often does. Unlike shale, slate makes a ringing sound
when you hit two pieces together.
||Used for walkways and patios.
|There are several different types of schist such as mica schist, garnet
schist, and chlorite schist depending on which minerals are abundant in
the rock. The picture on the left shows a mica schist. However, all schist
contains mica and often has rather large crystals of it.
||Can you find the garnets in this picture of
|Gneiss (pronounced "nice")
|This striped rock often looks a bit like fudge swirl ice cream. The light
colored layers are usually quartz and feldspar and the dark layers (the
fudge!) are mostly mica.
||The gneiss is nice in the Rocky Mountains!
Check out these pictures of gneiss near Lake Isabelle!
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The Fall 2010 issue of The Earth Scientist
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