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