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