Calcination: The powdered gypsum is heated to get rid of drinking water molecules, generating unique types of plaster with regards to the temperature and duration of heating. Hydration of Anhydrite: Gypsum can also form with the hydration of anhydrite (CaSO₄). Anhydrite is a calcium sulfate mineral that lacks the h2o https://www.propanraya.com/id/produk/eco-gypsum-ee-4050