'Columbite' definitions:
Definition of 'columbite'
(from WordNet)
noun
A black mineral that is an ore of niobium and tantalum [syn: niobite, columbite]
Definition of 'Columbite'
From: GCIDE
- 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]