COLUMBITE

niobite, columbite

(noun) a black mineral that is an ore of niobium and tantalum

Source: WordNet® 3.1

Etymology

Noun

columbite (plural columbites)

(mineral) A black mineral that is a mixed iron and manganese niobate and tantalate, and is the main ore of niobium and tantalum.

Source: Wiktionary

Co*lum"bite, n. Etym: [Cf. F. colombite. See Columbium.] (Min.)

Definition: 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.

Source: Webster’s Unabridged Dictionary 1913 Edition

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