Gypsum is really a tender sulfate mineral composed of calcium sulfate dihydrate, with the chemical formula CaSO4·2H2O.[four] It is actually widely mined which is utilised like a fertilizer and because the major constituent in lots of kinds of plaster, drywall and blackboard or sidewalk chalk. Around geological time scales, these https://www.propanraya.com/id/produk/eco-gypsum-ee-4050