Hydration Of Anhydrite: Gypsum could also sort throughout the hydration of anhydrite (CaSO₄). Anhydrite is a calcium sulfate mineral that lacks the drinking water molecules present in gypsum. When exposed to water, anhydrite undergoes a hydration reaction, incorporating h2o molecules into its composition and transforming into gypsum. Deposition: Gypsum at https://www.propanraya.com/id/produk/eco-gypsum-ee-4050