Tantalum occurs principally in the mineral columbite-tantalite.
There were no published price quotes for columbium-bearing columbite and pyrochlore concentrates.
British Dictionary definitions for columbite
a black mineral consisting of a niobium oxide of iron and manganese in orthorhombic crystalline form: occurs in coarse granite, often with tantalite, and is an ore of niobium. Formula: (Fe, Mn)(Nb)2O6Also called niobite