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Member of the zeolite group of minerals, CaAl2Si4O12.4H2O; sp. gr. 2.3; hardness 3.5; whitish; square prismatic crystals; occurs as a secondary mineral in veins and cavities within volcanic rocks and some associated mineral deposits, and may also occur within the zeolite facies of metamorphic rocks.

Subjects: Earth Sciences and Geography.

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