General Information:
Chemical Formula:Al12(SO4)5(OH)26·20H20
Composition:(Molecular Weight = 1,606.59 gm)Aluminum 20.15 %
AlHydrogen 4.14 %
H Sulfur 9.98 %
S Oxygen 65.73 %
O Empirical Formula: Al12(SO4)5(OH)26·20(H2O)
Environment:In a massive kaolinite-boehmite rock.
IMA Status:Approved IMA 1977
Locality:Salt Range, Pakistan.
Name Origin:Named for M. A. Zaher, Geological Survey of Bangladesh, who discovered the mineral.
Physical Properties: Cleavage:[???] Good
Color:white or light bluish green.
Density:2.007 - 2.011, Average = 2
Diaphaniety:Transparent to Translucent
Habits:Cryptocrystalline - Occurs as crystals too small to distinguish with the naked eye., Massive - Uniformly indistinguishable crystals forming large masses.,
Hardness:3.5 - Copper Penny
Luster:Earthy (Dull)
Streak:white
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