Section 05 Mineral products 25 Salt, sulphur; earths and stone; plastering materials, lirne and cement 25 11 Natural barium sulphate (barytes); natural barium carbonate (witherite), whether or n 25 11 20 Natural barium carbonate (whitherite) 25 11 20 00 Natural barium carbonate (whitherite) Commodity Code Description 25 11 20 00 00 Natural barium carbonate (whitherite)