Gypsum Is often a delicate sulfate mineral made up of calcium sulfate dihydrate, While using the chemical system CaSO4·2H2O.[four] It really is extensively mined and is particularly made use of for a fertilizer and because the major constituent in several sorts of plaster, drywall and blackboard or sidewalk chalk. Gypsum https://www.propanraya.com/id/produk/eco-gypsum-ee-4050