a mineral, anhydrous calcium sulfate, CaSO 4 , usually occurring in whitish or slightly colored masses.

1825–35; anhydr- + -ite1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
anhydrite (ænˈhaɪdraɪt)
a colourless or greyish-white mineral, found in sedimentary rocks. It is used in the manufacture of cement, fertilizers, and chemicals. Composition: anhydrous calcium sulphate. Formula: CaSO4. Crystal structure: orthorhombic
[C19: from anhydr(ous) + -ite1]

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Example sentences
When magma underneath the mountain cooled and the temperature dropped, the anhydrite began to dissolve.
Anhydrite was a relatively abundant, primary phenocryst phase.
Stratigraphic seals are provided by regionally extensive anhydrite and halite strata.
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