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Great South Gems & Minerals • Biotite •
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• Biotite •
(Montana)
Black mica - Basic patassium - magnesium - iron - aluminum silicate
Biotite is a black mica. Basic patassium, magnesium, iron, aluminum silicate. Hardness 2-1/2 to 3. Forms in thin layers or plates. Very elastic. Opaque to translucent.
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From the Rocky Boy Indian Reservation, Havre, Montana.
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| M695 Biotite (Montana) |
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