Biotite: Properties, Characteristics and Uses
Biotite is a mineral that can be a characteristic rock-former (igneous rocks), it is present in medium-grade metamorphic rocks and it also occurs as a mineral ... Formula and chemical composition: K(Mg,Fe)3(AlSi3O10)(F,OH)2: Color: Black, dark green, dark coffee: Brilliance, luster or diaphanity: glassy to submetallic: Stripe: White, light gray ...
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