Columbite

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [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]

From WordNet (r) 2.0 [wn]:

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