Idaite

General Information: Chemical Formula:Cu5FeS6 Composition:(Molecular Weight = 565.97 gm)Iron 9.87 % FeCopper 56.14 % CuSulfur 33.99 % S  Empirical Formula: Cu5Fe2+S6 Locality:Ida mine, Khan, and Tsumeb, Namibia. Name Origin:Named for the locality.Physical Properties: Color:brown, copper red, or red. Density:4.2 Diaphaniety:Opaque Habits:Microscopic Crystals - Crystals visible only with microscopes., Inclusions - Generally found as inclusions in other minerals., Hardness:2.5-3.5 - Finger Nail-Copper Penny Luster:MetallicMore details...