Section 05 Mineral products 25 Salt; sulphur; earths and stone; plastering materials, lime and cement 25 19 Natural magnesium carbonate (magnesite); fused magnesia; dead-burned (sintered) magnesia, whether or not containing small quantities of other oxides added before sintering; other magnesium oxide, whether or not pure. Commodity Code Description 25 19 10 Natural magnesium carbonate (magnesite) 25 19 90 Other