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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]