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

anhydrite (CaSO4) also occurs in rock masses, and is often associated with rock salt.
A Textbook of Assaying: For the Use of Those Connected with Mines. Cornelius Beringer and John Jacob Beringer

These observations appear to show that the change to anhydrite is a very gradual process at temperatures below a red heat.
Scientific American Supplement, No. 794, March 21, 1891 Various

anhydrite, anhydrous sulphate of calcium, a mineral presenting several varieties of structure and colour.
The New Gresham Encyclopedia. Vol. 1 Part 2 Various

Conversely gypsum may, under certain conditions, be dehydrated or reduced to anhydrite.
Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 7 Various

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


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  • Anhydrous

    with all water removed, especially water of crystallization. Historical Examples Above this temperature the anhydrous salt is the stable solid phase. The Phase Rule and Its Applications Alexander Findlay When perfectly pure and anhydrous, it forms a white and highly crystalline mass, rapidly decomposed by air and moisture. Cooley’s Cyclopdia of Practical Receipts and Collateral […]

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