Calcination: The powdered gypsum is heated to eliminate h2o molecules, generating distinct types of plaster according to the temperature and length of heating. Hydration of Anhydrite: Gypsum could also type from the hydration of anhydrite (CaSO₄). Anhydrite is actually a calcium sulfate mineral that lacks the water molecules present in https://www.propanraya.com/id/produk/eco-gypsum-ee-4050