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brown mica

A monoclinic mineral, K2Mg6(Si6Al2O20)(F,OH)4; a magnesium-rich end-member of the biotite crystal solution series; mica group; pseudohexagonal with perfect basal cleavage; occurs in crystalline limestones as a product of dedolomitization, in potassium2310 rich ultramafic rocks, as an alteration mineral in sulfur-rich hydrothermal assemblages, and in kimberlites.

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  • ed.young
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