Parnauite

General Information: Chemical Formula:Cu9(AsO4)2(SO4)(OH)10·7(H2O) Composition:(Molecular Weight = 1,242.00 gm)Copper 46.05 % CuArsenic 12.06 % AsHydrogen 1.95 % H Sulfur 2.58 % S Oxygen 37.36 % O  Empirical Formula: Cu9(AsO4)2(SO4)(OH)10·7(H2O) IMA Status:Approved IMA 1978Physical Properties: Cleavage:[???] Good Color:blue green, green, or light blue. Density:3.09 Hardness:2 - Gypsum Streak:greenish whiteMore details...