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prehnite

   Also found in: Dictionary/thesaurus, Wikipedia 0.02 sec.
prehnite [′prā‚nīt]
(mineralogy)
Ca2Al2Si3O10(OH)2A light-green to white mineral sorosilicate crystallizing in the orthorhombic system and generally found in reniform and stalactitic aggregates with crystalline surface; it has a vitreous luster, hardness is 6-6.5 on Mohs scale, and specific gravity is 2.8-2.9.


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