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BiotiteRock forming mineral of the mica group.
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BiotiteA black, brown, or dark-green mica, a magnesium iron silicate.
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Biotite(n) dark brown to black mica found in igneous and metamorphic rock
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BiotiteA common rock-forming mineral of the mica family. Biotite is a black or dark brown silicate
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BiotiteA common rock-forming mineral of the mica family. Biotite is a black or dark brown silicate rich in iron, magnesium, potassium, aluminum, and, of course, silica. Like other micas, it forms flat book-like crystals that peal apart into individual sheets on cleavage planes.
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BiotiteA platy magnesium-iron mica, common in igneous rocks. Bit
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