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Smithsonite has got the chemical formula ZnCO3 and so it is a carbonate. The chemical name for smithsonite is zinc carbonate. It has got a hardness of 5 and it crystallizes in the trigonal system. With a density of 4.3 g/cm3 to 4.5 g/cm3 smithsonite is quite a heavy mineral. Smithsonite can be found in form of tubers or clusters. Well grown crystals are rare. Smithsonite can have different colors. The color depends on the admixtures which are in the smithsonite. Smithsonite can be transparent, but I can also be opaque. Zinc is made of smithsonite and so smithsonite is a very important zinc ore. But also jewels are made of nice smithsonites. Smithsonite can be found in Mexico, in Greece, in Germany, in Namibia and in the USA.

Data about Smithsonite
Chemical formula ZnCO3
Mineral class carbonates
Crystal system trigonal
Hardness 5
Density 4.3 g/cm3 to 4.5 g/cm3
Color white, grey, yellow, red, green, blue, violet
Line color white
Gloss glass gloss
Break shell
Fissileness perfectly

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Last Update: 21.01.2006