Parnauite

General Information:
 Chemical Formula:
Cu9(AsO4)2(SO4)(OH)10·7(H2O)
 Composition:
(Molecular Weight = 1,242.00 gm)
Copper 46.05 % Cu
Arsenic 12.06 % As
Hydrogen 1.95 % H 
Sulfur 2.58 % S 
Oxygen 37.36 % O 
 Empirical Formula:
Cu9(AsO4)2(SO4)(OH)10·7(H2O)
 IMA Status:
Approved IMA 1978
Physical Properties:
 Cleavage:
[???] Good
 Color:
blue green, green, or light blue.
 Density:
3.09
 Hardness:
2 - Gypsum
 Streak:
greenish white
More details...