Calcination: The powdered gypsum is heated to remove h2o molecules, creating unique varieties of plaster depending on the temperature and period of heating. Hydration of Anhydrite: Gypsum could also sort from the hydration of anhydrite (CaSO₄). Anhydrite is actually a calcium sulfate mineral that lacks the h2o molecules present in https://www.propanraya.com/id/produk/eco-gypsum-ee-4050