Calcination: The Powdered gypsum is heated to eliminate drinking water molecules, making different types of plaster according to the temperature and duration of heating. Hydration of Anhydrite: Gypsum can also form with the hydration of anhydrite (CaSO₄). Anhydrite is usually a calcium sulfate mineral that lacks the h2o molecules current https://www.propanraya.com/id/produk/eco-gypsum-ee-4050