General Information:
Chemical Formula:Fe++Al2(SO4)4·22(H2O)
Composition:(Molecular Weight = 890.40 gm)Aluminum 6.06 %
AlIron 6.27 %
FeHydrogen 4.98 %
H Sulfur 14.41 %
S Oxygen 68.28 %
O Empirical Formula: Fe2+Al2(SO4)4·22(H2O)
Name Origin:From the Latin, halotrichum ="hairy salt."
Physical Properties: Cleavage:[010] Indistinct
Color:colorless, green, gray white, yellow, or white.
Density:1.78 - 1.9, Average = 1.84
Diaphaniety:Transparent to translucent
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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