Two colors of mica!
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Lisa Gardiner/Windows to the Universe
Mica minerals make some rocks sparkle!
Look for them in your igneous and metamorphic rocks. Do they make your rocks sparkle?
They break into flat plates because they have cleavage.
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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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