gadolinite


From The Collaborative International Dictionary of English v.0.48:

Gadolinite \Gad"o*lin*ite\, n. [Named after Gadolin, a Russian
   chemist.] (Min.)
   A mineral of a nearly black color and vitreous luster, and
   consisting principally of the silicates of yttrium, cerium,
   and iron.
   [1913 Webster]
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