Tantalite, [(Fe, Mn) Ta2O6], is a mineral that is close to columbite. In fact, the two are often grouped together as a semi-singular mineral called columbite-tantalite in many mineral guides. But Tantalite has a much greater specific gravity than Columbite (8.0+ compared to Columbite's 5.2).
Tantalite is black to brown in both color and streak. Manganese rich tantalites can be brown and translucent. Tantalite has been found in Namibia, Nigeria, Canada, Madagascar, northern Europe, and Maine, California, Colorado and Virginia in the United States. Brazil has the world's largest reserve of Tantalite (52.1%). As at 2006, 75% of world tantalite production comes from Australia.
Tantalite is largely found mixed with columbite in an ore called coltan.
U-Pb tantalite, Re-Os molybdenite, and [sup.40]Ar/ [sup.39]Ar muscovite dating of the Brazil Lake pegmatite, Nova Scotia: a possible shear-zone related origin for an LCT-type pegmatite.
Mar 01, 2005; ABSTRACT The Brazil Lake pegmatite of southwestern Nova Scotia is a rare example of Li-Cs-Ta (LCT) -type pegmatite in the Meguma...