Tantalite, [(Fe,Mn)(Ta,Nb)2O6],'s a mineral that's close to columbite. In fact, the two are often grouped together as a semi-singular mineral called columbite-tantalite in many mineral guides. However, tantalite has a much greater specific gravity than columbite (8.0+ compared to columbite's 5.2). Iron-rich tantalite's the mineral ferrotantalite and manganese-rich's manganotantalite. Ferrotantalite was first found at Skoböle, near Kemio, Kimito island, Turku-Pori, Finland. Tantalite's als… (More on Tantalite)