Zaherite

Zaherite is a mineral, a complex sulphate of aluminium, formula Al12(OH)26(SO4)5.20H2O. Discovered in 1977 in the Salt range, Punjab, Pakistan by Mohamed Abduz Zaher of the Bangladesh Geological Survey after whom it is named. This mineral would be extremely soluble in water and unlikely to persist anywhere except in the most arid of environments. It spontaneously, and reversibly dehydrates around room temperature. Its color is white to blue-green.
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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
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