columbite

2 definitions found

columbite - 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]

columbite - WordNet (r) 2.1 (2005) :

  columbite
      n 1: a black mineral that is an ore of niobium and tantalum
           [syn: niobite, columbite]