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