Source : Webster's Revised Unabridged Dictionary (1913)

Phlogopite \Phlog"o*pite\, n. [Gr. ? 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}.

Source : WordNet®

phlogopite
     n : a brown form of mica consisting of hydrous silicate of
         potassium and magnesium and aluminum