Apjohnite

General Information:
 Chemical Formula:
MnAl2(SO4)4·22(H2O)
 Composition:
(Molecular Weight = 889.49 gm)
Manganese 6.18 % Mn
Aluminum 6.07 % Al
Hydrogen 4.99 % H 
Sulfur 14.42 % S 
Oxygen 68.35 % O 
 Empirical Formula:
Mn2+Al2(SO4)4·22(H2O)
Physical Properties:
 Color:
colorless, white, pale yellow, pale green, or pale pink.
 Density:
1.8
 Diaphaniety:
Transparent
 Habits:
Fibrous - Crystals made up of fibers., Encrustations - Forms crust-like aggregates on matrix.,
 Hardness:
1.5-2 - Talc-Gypsum
 Luminescence:
None.
 Luster:
Silky
 Streak:
white
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