RHYS LEWIS & MINH TAN PHAM, AHS, DECD, UNISA / SCIENCE PHOTO LIBRARY RHYS LEWIS & MINH TAN PHAM, AHS, DECD, UNISA / SCIENCE PHOTO LIBRARY
Columbite, also called niobite, niobite-tantalite and columbate. This black mineral, chemical formula (Fe, Mn)Nb2O6 is a niobate of iron and manganese. It is an ore of niobium, and a constituent of coltan, from which the elements niobium and tantalum are extracted.
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