2519 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
2519 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