General Information:
Chemical Formula:
(Na,Ca)0,3(Al,Mg)2Si4O10(OH)2·n(H2O)
Composition:
(Molecular Weight = 540.47 gm)
Aluminum 9.98 % Al
Silicon 20.79 % Si
Hydrogen 4.10 % H
Oxygen 65.13 % O
Empirical Formula:
Al2Si4O10(OH)2(H2O)10
Locality:
Veinne, Montmorillone, France.
Name Origin:
Named after the locality.
Physical Properties:
Cleavage:
[001] Perfect
Color:
white, gray white, yellow, brownish yellow, or greenish yellow.
Density:
2 - 2.7, Average = 2.35
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:
None.
Luster:
Earthy (Dull)
Streak:
white
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