Zincovoltaite

General Information:
 Chemical Formula:
K2Zn5Fe+++3Al(SO4)12·18(H2O)
 Composition:
(Molecular Weight = 2,076.71 gm)
Potassium 3.77 % K 
Aluminum 1.30 % Al
Zinc 15.74 % Zn
Iron 8.07 % Fe
Hydrogen 1.75 % H 
Sulfur 18.53 % S 
Oxygen 50.85 % O 
 Empirical Formula:
K2Zn5Fe3+3Al(SO4)12·18(H2O)
 IMA Status:
Approved IMA
Physical Properties:
 Cleavage:
None
 Color:
green, greenish black, or black.
 Density:
2.756
 Diaphaniety:
Transparent to Translucent
 Hardness:
3 - Calcite
 Luster:
Vitreous - Resinous
 Streak:
gray green
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