NationMaster - Encyclopedia: Ferrotantalite

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 Skob�le, 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.

Ferrocolumbite - Wikipedia, the free encyclopedia (175 words)
	This mineral was first found at Haddam, Middlesex County, Connecticut in New England, USA.
	It forms a series with the tantalum-dominant analogue Ferrotantalite and one with the manganese-dominant analogue Manganocolumbite.
	In 1925, German chemists Walter Noddack, Otto Berg and Ida Tacke reported the discovery of element 43 and named it masurium.

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