Hydration Of Anhydrite: Gypsum may variety from the hydration of anhydrite (CaSO₄). Anhydrite can be a calcium sulfate mineral that lacks the drinking water molecules current in gypsum. When exposed to drinking water, anhydrite undergoes a hydration response, incorporating drinking water molecules into its framework and transforming into gypsum. Rehydration: https://www.propanraya.com/id/produk/eco-gypsum-ee-4050