Go To gem and mineral exhibits to see a wide variety of gypsum specimens and learn from professional collectors. Gypsum happens in intensive beds associated with other evaporite minerals (e.g., anhydrite and halite), especially in Permian and Triassic sedimentary formations; it can be deposited from ocean brine, accompanied by anhydrite https://www.propanraya.com/id/produk/eco-gypsum-ee-4050