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Vermiculite group
[A
+,2+
0.6-0.9
][ M
2-3
][(OH)
2
|T
4
O
10
],nH
2
O
Class:
Mica supergroup
< X
+,2+
Cations < 2:1 layer < Planar hydrous <
Phyllosilicate subclass
<
Silicate class
Class:
Phyllosilicate
System: Monoclinic
Trioctahedral: [ M
2+
3
]
Vermiculite
(Trioctahedral)
Dioctahedral: [ M
3+
2
]
Vermiculite (Dioctahedral)