Gypsum is a smooth sulfate mineral composed of calcium sulfate dihydrate, Using the chemical formulation CaSO4·2H2O.[4] It is broadly mined and is applied like a fertilizer and because the primary constituent in lots of sorts of plaster, drywall and blackboard or sidewalk chalk. Agates: A form of quartz that types https://www.propanraya.com/id/produk/eco-gypsum-ee-4050