Attend Gem and mineral exhibits to find out lots of gypsum specimens and learn from professional collectors. Gypsum takes place in considerable beds associated with other evaporite minerals (e.g., anhydrite and halite), particularly in Permian and Triassic sedimentary formations; it's deposited from ocean brine, followed by anhydrite and halite. In https://www.propanraya.com/id/produk/eco-gypsum-ee-4050