bi·o·tite /ˈbaɪəˌtaɪt/
  黑雲母
  Bi·o·tite n.  Min. Mica containing iron and magnesia, generally of a black or dark green color; -- a common constituent of crystalline rocks. See Mica.
  ◄ ►
  biotite
       n : dark brown to black mica found in igneous and metamorphic
           rock