Specimen data
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MONTMORILLONITE
(Na,Ca)
0.33
(Al,Mg)
2
Si
4
O
10
(OH)
2
·nH
2
O
Locality: Palermo #1 Mine, N. Groton, NH
Specimen Size: 3.5 cm specimen. Soft pink Montmorillonite bleb at top.
Environment: Phosphate pegmatite
Field collected: Tom Mortimer
