Ferrotantalite
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Ferrotantalite, (Fe, Mn)(Ta, Nb)2O6 is a black mineral that is an ore of niobium and tantalum. It has a submetallic luster, a high specific gravity and is a tantalate of iron and manganese, containing niobate of iron. This mineral was first found at Skoböle, near Kemio, Kimito island, Turku-Pori, Finland. It forms a series with the niobium-dominant analogue Ferrocolumbite and one with the manganese-dominant analogue manganotantalite.
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