Natrochalcite

General Information:
 Chemical Formula:
NaCu2(SO4)2(OH)·(H2O)
 Composition:
(Molecular Weight = 377.23 gm)
Sodium 6.09 % Na
Copper 33.69 % Cu
Hydrogen 0.80 % H 
Sulfur 17.00 % S 
Oxygen 42.41 % O 
 Empirical Formula:
NaCu2(SO4)2(OH)·(H2O)
Physical Properties:
 Cleavage:
[001] Perfect
 Color:
emerald green.
 Density:
3.49
 Diaphaniety:
Transparent
 Hardness:
4.5 - Between Fluorite and Apatite
 Luster:
Vitreous (Glassy)
 Streak:
greenish white
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