Section 05 Mineral products 25 Salt, sulphur; earths and stone; plastering materials, lirne and cement 25 20 Gypsum; anhydrite; plasters (consisting of calcined gypsum or calcium sulphate) whether or not coloured, with or without small quantities of accelerators or retarders Commodity Code Description 25 20 10 Gypsum 25 20 20 Plaster of Paris