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