Ferrocolumbite

Ferrocolumbite, also called niobite, columbate and columbite href="/encyclopedia/iron" title="iron">Fe, Mn)(Nb, Ta)2O6 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.

 

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