We are offering cobalt ores. Cobalt is a chemical element with symbol co and atomic number 27. It is found naturally only in chemically combined form. The free element, produced by reductive smelting, is a hard, lustrous, silver-gray metal. cobalt-based blue pigments have been used since ancient times for jewelry and paints, and to impart a distinctive blue tint to glass, but the color was later thought by alchemists to be due to the known metal bismuth. today, some cobalt is produced specifically from various metallic-lustered ores, for example cobaltite (coass), but the main source of the element is as a by-product of copper and nickel mining. The copper belt in the democratic republic of the congo and zambia yields most of the cobalt metal mined worldwide.