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This is a big crystal "book" of biotite mica, the variety of mica that is black due to iron in its c.....
Here is a large, lustrous book of iron-rich midnight black biotite mic, with a large green apatite c.....
This is a specimen of biotite mica that is the iron-rich, dark brownish black cousin of muscovite mi.....
Biotite mica is the iron-rich analog of clear muscovite mica. Like muscovite, thin sheets can .....
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