Concasseur,Moulin Raymond,Machine Mobile de . . mini concasseur mobile made in china YouTube 9 Jan 2014. Broyage Minéral Du Rajasthan M C Mfrs. Coltan (short for columbite–tantalites and known industrially as tantalite) is a dull black metallic ore, from which the elements niobium and tantalum are extracted. The niobiumdominant mineral in coltan is columbite (after niobium's original ...