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columbite


columbite
Columbite. Credit:Smithsonian Institution
A lustrous black oxide mineral of iron, manganese, and niobium [(Fe, Mn) Nb2O6]. It is the chief ore of niobium and is found mainly in Western Australia, Zaire, Madagascar, and South Dakota. Tantalum replaces niobium in all proportions up to 100% (tantalite). Columbite crystallizes in the orthorhombic system.


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