Hydration Of Anhydrite: Gypsum can also type with the hydration of anhydrite (CaSO₄). Anhydrite is actually a calcium sulfate mineral that lacks the drinking water molecules existing in gypsum. When exposed to drinking water, anhydrite undergoes a hydration reaction, incorporating drinking water molecules into its framework and remodeling into gypsum. https://www.propanraya.com/id/produk/eco-gypsum-ee-4050