Phlogopite /(?)/

Phlog·o·pite

Phlogopite

n.
  1. 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. (Min.)