Specimen data
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HEULANDITE
generalized formula
(Ca,Na)
2-3
Al
3
(Al,Si)
2
Si
13
O
36
·12H
2
O
Locality: Rt. 101, Rt. 101A road cut, Amherst, NH
Specimen Size: 2.3 mm crystal with Babingtonite, black
Environment: Zeolite vein in Gneiss
Field collected: Tom Mortimer
