lepidomelane
  鐵黑雲母
  Lep·i·dom·e·lane n.  Min. An iron-potash mica, of a raven-black color, usually found in granitic rocks in small six-sided tables, or as an aggregation of minute opaque scales. See Mica.
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  lepidomelane
       n : a mica that is a biotite containing iron