Rocks With Wavy Layers Are Foliated Metamorphic Rocks!
Do you see the little wavy layers in the pictures of foliated metamorphic rocks below?
All three of these rocks formed from a sedimentary rock called shale. With different amounts of metamorphism
, shale becomes different types of rocks!
(click for larger image)
||How Much Metamorphism?
|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.
|There are several different types of schist such as mica schist, garnet
schist, and chlorite schist depending on which minerals are found in the
rock. All schist contains mica.
|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.
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The Fall 2010 issue of The Earth Scientist
, focuses on rocks and minerals, including articles on minerals and mining, the use of minerals in society, and rare earth minerals, and includes 3 posters!
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