Malachite

General Information: Chemical Formula:Cu2(CO3)(OH)2 Composition:(Molecular Weight = 221.12 gm)Copper 57.48 % CuHydrogen 0.91 % H Carbon 5.43 % C Oxygen 36.18 % O  Empirical Formula: Cu2(CO3)(OH)2 Environment:Secondary mineral in the oxidized zones of copper ore deposits. IMA Status:Approved IMA 1962 Locality:Nizhne-Taglisk, Ural Mountains, Russia. Name Origin:From the Greek, malache, - "mallow" in reference to green leaf color.Physical Properties: Cleavage:[201] Perfect, [010] Fair Color:green, dark green, or blackish green. Density:3.6 - 4, Average = 3.8 Diaphaniety:Translucent to subtranslucent to opaque Habits:Botryoidal - "Grape-like" rounded forms (e.g.. malachite)., Stalactitic - Shaped like pendant columns as stalactites or stalagmites (e.g. calcite)., Massive - Fibrous - Distinctly fib rous fine-grained forms. Hardness:3.5-4 - Copper Penny-Flourite Luminescence:None. Luster:Vitreous - Silky Streak:light greenMore details...

C 2(CO3)(OH)2