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Montmorillonite
Type Locality
Montmorillon, Vienne, Poitou-Charentes, France
Mineral Data
(Na,Ca)
0.33
(Al,Mg)
2
(Si
4
O
10
)(OH)
2
·nH
2
O
Strunz:
9.EC.40
Physical Properties
Streak:
white
Hardness:
1.0 - 2.0
