Umangite

General Information: Chemical Formula:Cu3Se2 Composition:(Molecular Weight = 348.56 gm)Copper 54.69 % CuSelenium 45.31 % Se Empirical Formula: Cu3Se2 Name Origin:Named after the Sierra de Umango in Argentina.Physical Properties: Cleavage:[010] Distinct, [001] Distinct Color:blue black, brownish black, or red violet. Density:5.62 - 6.78, Average = 6.2 Diaphaniety:Opaque Habits:Massive - Granular - Common texture observed in granite and other igneous rock., , Hardness:3 - Calcite Luster:Metallic Streak:blackMore details...