columbite


From The Collaborative International Dictionary of English v.0.48:

Columbite \Co*lum"bite\, n. [Cf. F. colombite. See Columbium.]
   (Min.)
   A mineral of a black color, submetallic luster, and high
   specific specific gravity. It is a niobate (or columbate) of
   iron and manganese, containing tantalate of iron; -- first
   found in New England.
   [1913 Webster]
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