General Information:
Chemical Formula:
Al2Si4O10(OH)2
Composition:
(Molecular Weight = 360.31 gm)
Aluminum 14.98 % Al
Silicon 31.18 % Si
Hydrogen 0.56 % H
Oxygen 53.28 % O
Empirical Formula:
Al2Si4O10(OH)2
IMA Status:
Approved IMA
Locality:
Pyschminsk and Beresovsk, Ural Mountains, Russia.
Physical Properties:
Cleavage:
[001] Perfect
Color:
brown green, brownish yellow, greenish, gray green, or gray white.
Density:
2.8 - 2.9, Average = 2.84
Diaphaniety:
Translucent to opaque
Habits:
Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite)., ,
Hardness:
1.5-2 - Talc-Gypsum
Luminescence:
Fluorescent.
Luster:
Pearly
Streak:
white
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