Chalcoalumite

General Information:
 Chemical Formula:
CuAl4(SO4)(OH)12·3(H2O)
 Composition:
(Molecular Weight = 525.67 gm)
Aluminum 20.53 % Al
Copper 12.09 % Cu
Hydrogen 3.45 % H 
Sulfur 6.10 % S 
Oxygen 57.83 % O 
 Empirical Formula:
CuAl4(SO4)(OH)12·3(H2O)
Physical Properties:
 Cleavage:
[100] Perfect
 Color:
blue, blue gray, greenish blue, or light blue green.
 Density:
2.29
 Diaphaniety:
Transparent to Translucent
 Habits:
Fibrous - Crystals made up of fibers., Encrustations - Forms crust-like aggregates on matrix.,
 Hardness:
2.5 - Finger Nail
 Luminescence:
Non-fluorescent.
 Luster:
Vitreous - Dull
 Streak:
bluish white
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