General Information:
Chemical Formula:(NH4)Al3(SO4)2(OH)6
Composition:(Molecular Weight = 393.15 gm)Aluminum 20.59 %
AlHydrogen 2.56 %
H Sulfur 16.31 %
S Nitrogen 3.56 %
N Oxygen 56.97 %
O Empirical Formula: (NH4)Al3(SO4)2(OH)6
Environment:Acidic hot springs with temperatures below 100 deg C and low potassium content of the waters.
IMA Status:Approved IMA 1987
Locality:The Geysers, Sonoma County, California, USA.
Name Origin:Named for its composition (Ammonia, Al,).
Physical Properties: Cleavage:[???] Good
Color:gray white or white.
Density:2.4
Diaphaniety:Transparent to Translucent
Habits:Efflorescences - Crystals covering matrix, generally produced from transpiro-evaporation., Massive - Granular - Common texture observed in granite and other igneous rock., Rhombohedra l Crystals - Occurs as well-formed cryst
Hardness:2-3 - Gypsum-Calcite
Luminescence:Non-fluorescent.
Luster:Vitreous (Glassy)
Streak:white
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