• Webster's Revised Unabridged Dictionary
    • n Anhydrite (Min) A mineral of a white or a slightly bluish color, usually massive. It is anhydrous sulphate of lime, and differs from gypsum in not containing water (whence the name).
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Century Dictionary and Cyclopedia
    • n anhydrite Anhydrous sulphate of calcium. It is found in the salt-mines of Austria-Hungary, and in the Harz mountains, also in geodes in limestone at Lockport, N. Y., and in extensive beds in Nova Scotia. It is usually granular in structure, sometimes crystalline with cleavage in three rectangular directions. Its color is white or grayish-white, sometimes with a tinge of blue; also red. The vulpinite of Italy is the only variety used in the arts.
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Chambers's Twentieth Century Dictionary
    • n Anhydrite a mineral consisting of anhydrous sulphate of lime, with some slight addition of sea-salt, appearing in several varieties—granular, fibrous, radiated and translucent, compact and of various shades—white, blue, gray, red
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Webster's Revised Unabridged Dictionary
See Anhydrous
Chambers's Twentieth Century Dictionary
Gr. a, an, neg., hydōr, water.


In literature:

The name anhydrite was given by A.G. Werner in 1804, because of the absence of water, as contrasted with the presence of water in gypsum.
"Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1" by Various
Conversely gypsum may, under certain conditions, be dehydrated or reduced to anhydrite.
"Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 7" by Various