Examples of Foliated Metamorphic Rocks
The three metamorphic rocks listed below all form from a sedimentary rock called shale. Shale is made from mud and clay in places like seafloors 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. 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
, 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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