Hydration Of Anhydrite: Gypsum may form throughout the hydration of anhydrite (CaSO₄). Anhydrite is usually a calcium sulfate mineral that lacks the h2o molecules present in gypsum. When exposed to water, anhydrite undergoes a hydration reaction, incorporating water molecules into its composition and remodeling into gypsum. What Are another Options? https://www.propanraya.com/id/produk/eco-gypsum-ee-4050