Webster’s Revised Unabridged Dictionary · 1913
Phlogopite
Phlog′o·pite (flŏg′ō·pīt), n. [Gr. φλογωπός firelike.] (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.