Gypsum is often a gentle sulfate mineral made up of calcium sulfate dihydrate, Using the chemical formulation CaSO4·2H2O.[four] It is actually greatly mined and is particularly applied like a fertilizer and because the primary constituent in several kinds of plaster, drywall and blackboard or sidewalk chalk. Calcination: The rock is https://www.propanraya.com/id/produk/eco-gypsum-ee-4050