General Information:
Chemical Formula:K2Zn5Fe+++3Al(SO4)12·18(H2O)
Composition:(Molecular Weight = 2,076.71 gm)Potassium 3.77 %
K Aluminum 1.30 %
AlZinc 15.74 %
ZnIron 8.07 %
FeHydrogen 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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