Tantalite, a mineral close to niobite-columbite, chemical formula ((Fe,Mn)(Ta, Nb)2O6). The two are often grouped as a semi-singular mineral called co

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Tantalite, a mineral close to niobite-columbite, chemical formula ((Fe,Mn)(Ta, Nb)2O6). The two are often grouped as a semi-singular mineral called columbite-tantalite or coltan. Tantalite is black to brown in colour and streak, used an ore of tantalum and niobium. From Namaqualand in South Africa. Size 40mm.

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Photo credit: © DIRK WIERSMA/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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Keywords: africa, coltan, columbite-tantalite, environment, geological, geology, mineral, namaqualand, nature, niobite-columbite, niobium, ore, rock, south, tantalite, tantalum