Hydration Of Anhydrite: Gypsum could also form throughout the hydration of anhydrite (CaSO₄). Anhydrite is often a calcium sulfate mineral that lacks the h2o molecules current in gypsum. When subjected to water, anhydrite undergoes a hydration reaction, incorporating h2o molecules into its structure and reworking into gypsum. Soil Amendment: Gypsum, https://www.propanraya.com/id/produk/eco-gypsum-ee-4050