Kamchatkite

General Information:
 Chemical Formula:
KCu++3OCl(SO4)2
 Composition:
(Molecular Weight = 473.32 gm)
Potassium 8.26 % K 
Copper 40.28 % Cu
Sulfur 13.55 % S 
Chlorine 7.49 % Cl
Oxygen 30.42 % O 
 Empirical Formula:
KCu3OCl(SO4)2
 IMA Status:
Approved IMA
Physical Properties:
 Cleavage:
[???] Perfect
 Color:
greenish brown.
 Density:
3.48
 Diaphaniety:
Transparent
 Hardness:
3.5 - Copper Penny
 Luster:
Vitreous (Glassy)
 Streak:
yellow
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