Hammarite

General Information: Chemical Formula:Pb2Cu2Bi4S9 (?) Composition:(Molecular Weight = 1,666.01 gm)Copper 7.63 % CuBismuth 50.18 % BiLead 24.87 % PbSulfur 17.32 % S  Empirical Formula: Pb2Cu2Bi4S9 Locality:Gladhammer, Province of Kalmar, Sweden. Name Origin:Named after its locality.Physical Properties: Cleavage:[010] Good Color:reddish steel gray. Density:6.73 Diaphaniety:Opaque Habits:Acicular - Occurs as needle-like crystals., , Hardness:3-4 - Calcite-Fluorite Luster:Metallic Streak:blackMore details...