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<!--Heating gypsum to between 100°C and 150°C (302°F) partially [[dehydrate]]s the mineral by driving off exactly 75% of the water contained in its chemical structure. The temperature and time needed depend on ambient partial pressure of H<sub>2</sub>O. Temperatures as high as 170°C are used in industrial calcination, but at these temperatures the anhydrite begins to be formed.
The reaction for the partial dehydration is:-->
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