Gerhardtite

General Information:
 Chemical Formula:
Cu2(NO3)(OH)3
 Composition:
(Molecular Weight = 240.12 gm)
Copper 52.93 % Cu
Hydrogen 1.26 % H 
Nitrogen 5.83 % N 
Oxygen 39.98 % O 
 Empirical Formula:
Cu2(NO3)(OH)3
Physical Properties:
 Cleavage:
[001] Perfect, [100] Good
 Color:
green or dark green.
 Density:
3.4 - 3.43, Average = 3.41
 Diaphaniety:
Transparent
 Hardness:
2 - Gypsum
 Luster:
Vitreous (Glassy)
 Streak:
light green
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