slovodefinícia
columbite
(encz)
columbite,niobit Zdeněk Brož
Columbite
(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]
columbite
(wn)
columbite
n 1: a black mineral that is an ore of niobium and tantalum
[syn: niobite, columbite]
podobné slovodefinícia
columbite-tantalite
(encz)
columbite-tantalite, n:
Columbite
(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]
Yttro-columbite
(gcide)
Yttro-columbite \Yt`tro-co*lum"bite\, Yttro-tantalite
\Yt`tro-tan"ta*lite\, n. (Min.)
A tantalate of uranium, yttrium, and calcium, of a brown or
black color.
[1913 Webster]
columbite-tantalite
(wn)
columbite-tantalite
n 1: a valuable black mineral combining niobite and tantalite;
used in cell phones and computer chips [syn: {columbite-
tantalite}, coltan]

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