Delafossite

General Information:
 Chemical Formula:
Cu+Fe+++O2
 Composition:
(Molecular Weight = 151.39 gm)
Iron 36.89 % Fe
Copper 41.97 % Cu
Oxygen 21.14 % O 
 Empirical Formula:
CuFe3+O2
 Locality:
Calumet and Arizona mine, Bisbee, Cochise Co., Arizona, USA.
Physical Properties:
 Cleavage:
[1010] Indistinct
 Color:
black.
 Density:
5.41
 Diaphaniety:
Opaque
 Habits:
Crystalline - Coarse - Occurs as well-formed coarse sized crystals., Tabular - Form dimensions are thin in one direction.,
 Hardness:
5.5 - Knife Blade
 Luminescence:
Non-fluorescent.
 Luster:
Metallic
 Streak:
black
More details...