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biotite
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biotite

Dark mica, K(Mg, Fe)3Al Si3O10(OH, F)2, a common silicate mineral. It is brown to black with shiny surfaces, and like all micas, it splits into very thin flakes along its one perfect cleavage. Biotite is a mineral found in igneous rocks, such as granites, and metamorphic rocks such as schists and gneisses.
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