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Niobite

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Niobite, also called 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 in New England.

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