Show Up at gem and mineral displays to see a wide variety of gypsum specimens and study from professional collectors. Gypsum happens in intensive beds affiliated with other evaporite minerals (e.g., anhydrite and halite), especially in Permian and Triassic sedimentary formations; it's deposited from ocean brine, followed by anhydrite and https://www.propanraya.com/id/produk/eco-gypsum-ee-4050