Gypsum Can be a delicate sulfate mineral made up of calcium sulfate dihydrate, Together with the chemical system CaSO4·2H2O.[4] It is actually greatly mined and is also used as being a fertilizer and because the most important constituent in lots of varieties of plaster, drywall and blackboard or sidewalk chalk. https://www.propanraya.com/id/produk/eco-gypsum-ee-4050