Gypsum is usually a gentle sulfate mineral composed of calcium sulfate dihydrate, With all the chemical method CaSO4·2H2O.[four] It really is greatly mined and it is made use of for a fertilizer and because the major constituent in several kinds of plaster, drywall and blackboard or sidewalk chalk. If you https://www.propanraya.com/id/produk/eco-gypsum-ee-4050