phlog·o·pite /ˈflɑgəˌpaɪt/
Phlog·o·pite n. Min. A kind of mica having generally a peculiar bronze-red or copperlike color and a pearly luster. It is a silicate of aluminia, with magnesia, potash, and some fluorine. It is characteristic of crystalline limestone or dolomite and serpentine. See Mica.
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phlogopite
n : a brown form of mica consisting of hydrous silicate of
potassium and magnesium and aluminum