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Ammonium aluminium sulfate, also known as ammonium alum or just alum, is a white crystalline double sulfate usually encountered as the dodecahydrate, formula (NH4)Al(SO4)2·12H2O. It is used in small amounts in a variety of niche applications. The dodecahydrate occurs naturally as the rare mineral tschermigite.

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General Information:
 Chemical Formula:
(Molecular Weight = 453.33 gm)
Aluminum 5.95 % Al
Hydrogen 6.23 % H 
Sulfur 14.15 % S 
Nitrogen 3.09 % N 
Oxygen 70.59 % O 
 Empirical Formula:
Cermniky, Czechoslovakia.
 Name Origin:
Named after the locality.
Physical Properties:
[100] Perfect
white or colorless.
Transparent to translucent
Crystalline - Coarse - Occurs as well-formed coarse sized crystals., Fibrous - Crystals made up of fibers.,
1.5-2 - Talc-Gypsum
Vitreous (Glassy)
More details...

1. a white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminum
(synonym) alum, ammonium alum
(hypernym) aluminum, aluminium, Al, atomic number 13

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