Gypsum Are available in hydrothermal veins, that happen to be fractures in rocks full of mineral-abundant fluids that originate from deep within the Earth's crust. Reactivity: It's chemically stable below usual conditions but reacts with sulfuric acid, forming more soluble calcium sulfate. Be a part of a neighborhood rockhounding club https://www.propanraya.com/id/produk/eco-gypsum-ee-4050