Azurite, Cu3(CO3)2(OH) (Basic Copper Carbonate), is so named because of its intense blue colour, which also explains its popularity with collectors. The colour is very distinctive, although the shade varies among specimens. It is formed by the action of carbon dioxide and water on Copper Sulfides.

Description: A flattened matrix of limestone covered by a thin deposit of scale-like malachite. Upon this sit approximately 15 balls of Azurite. These are well formed spheres, whose composition under magnification can be seen to be radial clusters of needle-like crystals.

Location: Tsumeb, Otavi, Namibia.