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Meaning of columbite

co•lum•bite

Pronunciation: (ku-lum'bīt), [key]
— n.
  1. a black, crystalline mineral, iron niobate, (Fe, Mn)NbO, the principal ore of niobium, an end member of a series of solid solutions in which manganese and tantalum combine to form tantalite.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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