DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Niobite (or columbite), a niobite of iron and manganese containing tantalite of iron with chemical formula ((Fe,Mn)(Nb, Ta)2O6). It is orthorhombic and may rarely form well developed black crystals, as seen here. Niobite is an ore for extracting niobium and tantalum. From Kragero in Norway.
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