german buyers of wolframite and tantalite

german buyers of wolframite and tantalite

  • ColtanWikipedia

    Coltan (short for columbitetantalite and known industrially as tantalite) is a dull black metallic ore from which the elements niobium and tantalum are extracted. The niobium dominant mineral in coltan is columbite (after niobium's

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  • Journal of weekly news and commentaries about rocks

    lc John BettsFine Minerals, New York, NY Dealers of Fine Minerals and Natural Crystal Clusters since 1989. Journal of weekly news and commentaries about rocks and minerals and mineral collectingJohn Betts' Mineral Blog

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