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