The mineral smithsonite is a zinc carbonate having the chemical formula ZnCO3. It is also known under the names calamine and calamine. The French name for the town of La Calamine La Calamine refers to the latter description. Smithsonite can be white, gray, green, pink or blue, with a white stripe color. It has a specific gravity of 4.4 and a hardness of 4.5 on the Mohs hardness scale. The gloss is to pearly glass and the material is transparent to translucent. The normally occurring smithsonite, super genetically caused by oxidation of zinc ores, is associated with other genetic super lead minerals. The main sites are Broken Hill in New South Wales (Australia), Tsumeb in Namibia and the Kelly mine to Magdalena in New Mexico (United States). Also in Monte Poni, Sardinia nice aggregates and stalactites found. In Belgium smithsonite found in the surroundings of La Calamine and Moresnet, where it was mined on a large scale.