Section 05 Mineral products 25 Salt, sulphur; earths and stone; plastering materials, lime and cement 25 11 Natural barium sulphate (barytes); natural barium carbonate (witherite), whether or not calcined, other than barium oxide of heading 2816 25 11 20 - Natural barium carbonate (witherite) Commodity Code Description 25 11 20 00 - Natural barium carbonate (witherite)