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  • Coltan - Wikipedia

    Coltan is a dull black metallic ore from which the elements niobium and tantalum are extracted , A piece of columbite-tantalite, size 60 x 25 x 21 cm , artisanal mines, and so it hinders the development of processing infrastructure in DRC

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  • Columbite-(Fe) Mineral Data

    Help on Synonym: Synonym: Coltan Columbite-Tantalite Ferrocolumbite - Renamed to Columbite-(Fe) by Mineralogical Record, v39 (2008), p 131 Niobite.

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  • Columbite: The mineral columbite-tantalite information and pictures

    Columbite forms a solid solution series with Tantalite known as the Columbite-Tantalite seri Columbite is the niobium-rich member, and Tantalite is the.

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  • Columbite - Wikipedia

    Columbite, also called niobite, niobite-tantalite and columbate [(Fe, Mn)Nb2O6], is a black mineral group that is an ore of niobium It has a submetallic luster and.

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  • Tantalite - Wikipedia

    The mineral group tantalite [(Fe, Mn)Ta2O6] is the primary source of the chemical element tantalum It is chemically similar to columbite, and the two are often.

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