Hydration Of Anhydrite: Gypsum can also variety in the hydration of anhydrite (CaSO₄). Anhydrite is often a calcium sulfate mineral that lacks the h2o molecules current in gypsum. When exposed to water, anhydrite undergoes a hydration reaction, incorporating water molecules into its construction and remodeling into gypsum. Plaster: Gypsum plaster https://www.propanraya.com/id/produk/eco-gypsum-ee-4050