Hypertext Webster Gateway: "anhydrite"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Anhydrite \An*hy"drite\, n. [See {Anhydrous}.] (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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