You searched for: “anhydrite”
1. A mineral of a white or a slightly bluish color, usually massive.
It is anhydrous sulphate of lime, and differs from gypsum because it does not contain water (whence the name).2. A mineral consisting of anhydrous calcium sulfate, commonly formed as massive or laminated evaporites; which may be altered by hydration to gypsum, as in weathering.
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