The Ferrocolumbite reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Ferrocolumbite

Ferrocolumbite, also called niobite, columbate and columbite (Fe, Mn)(Nb, Ta)₂)O₆]) is a black mineral that is an ore of niobium and tantalum. It has a submetallic luster and a high specific gravity and is a niobate of iron and manganese, containing tantalate of iron. This mineral was first found at Haddam, Middlesex County, Connecticut in New England, USA. It forms a series with the tantalum-dominant analogue Ferrotantalite and one with the manganese-dominant analogue Manganocolumbite.

See also: List of minerals -- 14:44, 5 Mar 2004 (UTC) This article is a stub. You can help Wikipedia by expanding it.

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