stau·ro·lite /ˈstɔrəˌlaɪt/
  十字石
  Stau·ro·lite n.  Min. A mineral of a brown to black color occurring in prismatic crystals, often twinned so as to form groups resembling a cross.  It is a silicate of alumina and iron, and is generally found imbedded in mica schist.  Called also granatite, and grenatite.
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