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Columbite, also called niobite, niobitetantalite and columbate [(Fe, Mn)Nb 2 O 6], is a black mineral group that is an ore of niobium. It has a submetallic luster ...

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Comparable ores of zirconium (zircon), tantalum (tantalite) and sometimes niobium (columbite) require highly corrosive hydrofluoric acid to process into end products.

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