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columbite

(kə lum′bīt′)

noun

a black, orthorhombic mineral, (Fe,Mn)(Nb,Ta)O, that is an ore of niobium and tantalum

Origin: columb(ium) + -ite

See columbite in American Heritage Dictionary 4

noun

A black, red-brown, or colorless mineral, essentially (Fe, Mn)(Nb, Ta)₂O₆, the principal ore of niobium.

Origin:

Origin: columb(ium)

Origin: + -ite¹

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