The natural gypsum powder includes anhydrous gypsum and CaSO₄・2H₂O, if you want to commercialize the gypsum powder. you should adopt the CaSO₄・2H₂O, after removing part of water by heating, it will become CaSO₄・1/2H₂O.After calcining, CaSO₄・ 1/2H₂O is very popular in paper faced gypsum board and gypsum block and painting gypsum powder and model.