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