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