Gypsum can be a tender sulfate mineral made up of calcium sulfate dihydrate, Along with the chemical method CaSO4·2H2O.[4] It can be greatly mined which is utilised for a fertilizer and because the most important constituent in many varieties of plaster, drywall and blackboard or sidewalk chalk. Agates: A type https://www.propanraya.com/id/produk/eco-gypsum-ee-4050