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From The Collaborative International Dictionary of English v.0.44 [gcide]:
Columbite \Co*lum"bite\, noun [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.
From WordNet (r) 2.0 [wn]:
columbite
noun: a black mineral that is an ore of niobium and tantalum [syn: {niobite}]
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