Coltan (short for columbitetantalite and known industrially as tantalite) is a dull black metallic ore from which the elements niobium and tantalum are extracted.Live Chat
Galena is the main ore of lead, used since ancient times. Because of its somewhat low melting point, it was easy to liberate by smelting. In some deposits galenaLive Chat
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Malachite is a green copper mineral used as a gemstone, sculptural material, and pigment for millenia. It is a minor ore of copper but is more valuable today forLive Chat
John BettsFine Minerals, New York, NY Dealers of Fine Minerals and Natural Crystal Clusters since 1989. Mineral Species Quick Reference GuideLive Chat
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