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72 bytes added ,  15:50, 11 March 2014
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Gypsum is an [[evaporite]], CaSO<sub>4</sub>•2(H<sub>2</sub>O).
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Gypsum is an [[evaporite]], CaSO<sub>4</sub>•2(H<sub>2</sub>O).  When dewatered at temperatures above 200°C, it becomes [[anhydrite]].
    
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