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How does biotite mica differ from muscovite mica?

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The mica minerals have one perfect cleavage that allows them to be broken into very thin sheets. This is very distinctive. Muscovite is clear, silvery, or coppery silver in color (depending on the thickness of the sample and presence of impurities) whereas fresh biotite is black. read more

Biotite is a very common form of mica. It is named in honor Jean Baptiste Biot (1774 - 1862), a French physicist, mathematician, and astronomer who researched the mica minerals for their optical properties. read more

Muscovite is a “white” mica consisting mainly of K, Al and of course Si. Biotite is a “brown” mica group incorporating Mg and Fe. Given their chemical differences you find them in different rocks. read more

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