anhydrite

[an-hahy-drahyt]
noun
a mineral, anhydrous calcium sulfate, CaSO 4 , usually occurring in whitish or slightly colored masses.

Origin:
1825–35; anhydr- + -ite1

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anhydrite (ænˈhaɪdraɪt)
 
n
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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