Giraudite

General Information: Chemical Formula:(Cu,Zn,Ag)12(As,Sb)4(Se,S)13 Composition:(Molecular Weight = 2,042.97 gm)Zinc 11.52 % ZnCopper 22.40 % CuSilver 6.34 % AgAntimony 5.96 % SbArsenic 11.00 % AsSelenium 37.68 % SeSulfur 5.10 % S  Empirical Formula: Cu7.2Zn3.6Ag1.2As3SbSe9.75S3.25 IMA Status:Approved IMA 1982Physical Properties: Cleavage:None Color:gray or steel gray. Density:5.75 Diaphaniety:Opaque Hardness:3.5-4 - Copper Penny-Flourite Luster:Metallic Streak:whiteMore details...

(C ,Zn,Ag)12(As,Sb)4(Se,S)13