Gypsum can be a smooth sulfate mineral composed of calcium sulfate dihydrate, With all the chemical formula CaSO4·2H2O.[four] It really is extensively mined which is made use of for a fertilizer and because the major constituent in several types of plaster, drywall and blackboard or sidewalk chalk. You need to https://www.propanraya.com/id/produk/eco-gypsum-ee-4050