Hydration Of Anhydrite: Gypsum may also kind with the hydration of anhydrite (CaSO₄). Anhydrite is often a calcium sulfate mineral that lacks the water molecules existing in gypsum. When exposed to h2o, anhydrite undergoes a hydration response, incorporating h2o molecules into its framework and reworking into gypsum. Plaster: Gypsum plaster https://www.propanraya.com/id/produk/eco-gypsum-ee-4050