Hydration Of Anhydrite: Gypsum could also type with the hydration of anhydrite (CaSO₄). Anhydrite is a calcium sulfate mineral that lacks the h2o molecules present in gypsum. When exposed to h2o, anhydrite undergoes a hydration response, incorporating drinking water molecules into its construction and transforming into gypsum. Plaster: Gypsum plaster https://www.propanraya.com/id/produk/eco-gypsum-ee-4050