Gypsum is actually a smooth sulfate mineral composed of calcium sulfate dihydrate, Using the chemical system CaSO4·2H2O.[four] It is actually broadly mined and is used for a fertilizer and as the major constituent in lots of forms of plaster, drywall and blackboard or sidewalk chalk. Gypsum happens in intensive beds https://www.propanraya.com/id/produk/eco-gypsum-ee-4050