Azurite

General Information: Chemical Formula:Cu3(CO3)2(OH)2 Composition:(Molecular Weight = 344.67 gm)Copper 55.31 % CuHydrogen 0.58 % H Carbon 6.97 % C Oxygen 37.14 % O  Empirical Formula: Cu3(CO3)2(OH)2 Environment:Secondary mineral in the oxidized zone of copper ore deposits. IMA Status:Accepted IMA 1980 Locality:Tsumeb near Otavi, Namibia. Name Origin:From the Persian lazhward, meaning "blue.".Physical Properties: Cleavage:[011] Perfect, [100] Fair Color:azure blue, blue, light blue, or dark blue. Density:3.77 - 3.89, Average = 3.83 Diaphaniety:Transparent to subtranslucent Habits:Tabular - Form dimensions are thin in one direction., Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline)., Stalactitic - Shaped like pendant columns as stalactites or s talagmites (e.g. calcite). Hardness:3.5-4 - Copper Penny-Flourite Luminescence:None. Luster:Vitreous (Glassy) Streak:light blueMore details...

C 3(CO3)2(OH)2