Aikinite

General Information: Chemical Formula:PbCuBiS3 Composition:(Molecular Weight = 575.92 gm)Copper 11.03 % CuBismuth 36.29 % BiLead 35.98 % PbSulfur 16.70 % S  Empirical Formula: PbCuBiS3 Locality:TL: Berezovsk near Ekaterinburg, Ural Mountains.Physical Properties: Cleavage:[010] Indistinct Color:lead gray, grayish black, or reddish brown. Density:6.1 - 6.8, Average = 6.44 Diaphaniety:Opaque Habits:Acicular - Occurs as needle-like crystals., Massive - Uniformly indistinguishable crystals forming large masses., Hardness:2-2.5 - Gypsum-Finger Nail Luster:Metallic Streak:grayish blackMore details...