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