anhydrite

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anhydrite

[an′hī‚drīt]
(mineralogy)
CaSO4 A 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.