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