Idaite

General Information:
 Chemical Formula:
Cu5FeS6
 Composition:
(Molecular Weight = 565.97 gm)
Iron 9.87 % Fe
Copper 56.14 % Cu
Sulfur 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:
Metallic
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