Laumontite, item 276

Laumontite, item 276


Laumontite from Guanajuato, Gto., Mexico.

6 1/2" X 7 1/2" X 2 1/2 thick.  

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Laumontite is associated with Calcite and "loses water readily upon exposure to the atmosphere and converts to a white powder unless first immersed in a plastic or other sealant." according to The Audubon Society Field Guide to North American Rocks and Minerals, 1978.