Gypsum is really a tender sulfate mineral composed of calcium sulfate dihydrate, Together with the chemical method CaSO4·2H2O.[four] It is widely mined and is also employed to be a fertilizer and because the major constituent in several types of plaster, drywall and blackboard or sidewalk chalk. More than geological time https://www.propanraya.com/id/produk/eco-gypsum-ee-4050