Columbite
Columbite, commonly called niobite, niobite-tantalite and columbate [(Fe, Mn)(Nb, Ta)2O6], is a black mineral group that is an ore of niobium and tantalum. It has a submetallic luster and a high density and is a niobate of iron and manganese, containing tantalate of iron. Columbite has the same arrangement and crystal symmetry (orthorombic) as tantalite. Columbite is also very alike to tapiolite.
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