gad·o·lin·ite /ˈgædḷəˌnaɪt/
  矽鈹釔礦
  Gad·o·lin·ite n.  Min. A mineral of a nearly black color and vitreous luster, and consisting principally of the silicates of yttrium, cerium, and iron.
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  gadolinite
       n : a mineral that is a source of rare earths; consists of
           silicates of iron and beryllium and cerium and yttrium
           and erbium [syn: ytterbite]