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Anhydrite (calcium sulfate) is frequently found as a finely granular rather than crystalline rock. It may occur in either thick beds or thinly laminated. The anhydrite mineral will usually hydrate when exposed to water and form gypsum (hydrous calcium sulfate) which involves significant swelling. Because the formation of karst is controlled by the rate of physical solution, the karstic features do not develop as well in humid climates because the mechanical weathering of the material is great. Anhydrite is considered an evaporite rock.
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