Theisite

General Information: Chemical Formula:Cu5Zn5[(As+++++,Sb+++++)O4]2(OH)14 Composition:(Molecular Weight = 1,184.04 gm)Zinc 27.61 % ZnCopper 26.83 % CuAntimony 5.14 % SbArsenic 9.49 % AsHydrogen 1.19 % H Oxygen 29.73 % O  Empirical Formula: Cu5Zn5(AsO4)1.5(SbO4)0.5(OH)14 Environment:Found in a uranium prospect. IMA Status:Approved IMA 1980 Locality:Durango, La Plata, County, Colorade, USA. Name Origin:Named for Nicholas J. Theis, Geologist, Bendix Corp., who discovered the orignal sample.Physical Properties: Cleavage:[001] Perfect Color:blue green or green. Density:4.3 Diaphaniety:Translucent Habits:Aggregates - Made of numerous individual crystals or clusters., , Hardness:1.5 - Between Talc and GypsumMore details...

C 5Zn5(AsO4,SbO4)2(OH)14