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anhydrite
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anhydrite

Rock-forming mineral, anhydrous calcium sulfate (CaSO4), which differs chemically from gypsum (to which it changes in humid conditions) by having no water of crystallization. Anhydrite occurs most often with salt deposits in association with gypsum, as in the cap rock of the Texas-Louisiana salt domes. Anhydrite is one of the major minerals in evaporite deposits; it is also present in dolomites and limestones, and in ore veins. It is used in plasters and cement as a drying agent.


anhydrite [an′hī‚drīt]
(mineralogy)
CaSO4A mineral that represents gypsum without its water of crystallization, occurring commonly in white and grayish granular to compact masses; the hardness is 3-3.5 on Mohs scale, and specific gravity is 2.90-2.99. Also known as cube spar.

anhydrite
A natural mineral calcium sulfate, used in the manufacture of portland cement to control its set.


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