Gypsum is actually a tender sulfate mineral composed of calcium sulfate dihydrate, with the chemical components CaSO4·2H2O.[four] It is actually broadly mined and is used to be a fertilizer and as the primary constituent in many kinds of plaster, drywall and blackboard or sidewalk chalk. Halite and gypsum both of https://www.propanraya.com/id/produk/eco-gypsum-ee-4050