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