General Information:
Chemical Formula:
(NH4)Al3(SO4)2(OH)6
Composition:
(Molecular Weight = 393.15 gm)
Aluminum 20.59 % Al
Hydrogen 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
More details...