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Mica supergroup [abbr. Mca ]
[ A ][M
2-3
][X|T
4
O
10
]
A: [ 2+: Ca, Ba ][ 1+: K, Na, Rb, Cs, NH
4
]
M: [ 4+: Ti ][ 3+: Al, Fe, Mn, Cr, V ][ 2+: Fe, Mn, Mg ][ 1+: Li ]
T: [ 4+: Si ][ 3+: Al, Fe, B, Be ]
X: [ 2-: S, O ][ 1-: OH, F, Cl ]
[ A
+,2+
0.2-0.6
],nH
2
O:
Smectite group
[ A
+,2+
0.6-0.9
],nH
2
O:
Vermiculite group
[ A
+
]:
True mica group
[ A
+
0.5-0.8
]:
Interlayer-deficient mica group
[ A
2+
]:
Brittle mica group
Class: X
+,2+
Cations < 2:1 layer < Planar hydrous <
Phyllosilicate subclass
<
Silicate class
Class:
Phyllosilicate
System: Monoclinic