General Information:
Chemical Formula:
Al12(SO4)5(OH)26·20H20
Composition:
(Molecular Weight = 1,606.59 gm)
Aluminum 20.15 % Al
Hydrogen 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
More details...