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heulandite

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heulandite [′hyü·lən‚dīt]
(mineralogy)
CaAl2Si6O16·5H2O A zeolite mineral that crystallizes in the monoclinic system; often occurs as foliated masses or in crystal form in cavities of decomposed basic igneous rocks.


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There does not appear to be any evidence in the literature to support the presence of variable charge on heulandite (Ming and Mumpton 1989) or quartz (Drees et al.
Comparison is made with assemblages at Arlington Quarry on North Mountain, where the dominant zeolite minerals are heulandite (sensu stricto) and stilbite.
The zeolites are represented by: clinoptilolite and only sporadically by mordenite and heulandite.
 
 
 
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