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
More details...