Section 05 MINERAL PRODUCTS 25 SALT;SULPHUR;EARTHS AND STONE;PLASTERING MINERALS, LIME AND CEMENT 25 19 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...FUSED MAGNESIA;DEAD-BURNED MAGNESIA...OTHER MAGNESIUM OXIDE..ETC