Chapter 25

Salt; sulphur; earths, stone; plastering materials, lime and cement

2501 Salt (including table salt and denatured salt); pure sodium chloride whether or not in aqueous solution; sea water 1
2502 Iron pyrites; unroasted 1
2503 Sulphur of all kinds; other than sublimed, precipitated and colloidal sulphur 1
2506 Quartz; (other than natural sands), quartzite, whether or not roughly trimmed or merely cut, by sawing or otherwise, into blocks or slabs of a rectangular (including square) shape 2
2507 Kaolin and other kaolinic clays; whether or not calcined 1
2509 Chalk 1
2511 Natural barium sulphate (barytes); natural barium carbonate, (witherite) whether or not calcined, other than barium oxide of heading no. 2816 2
2512 Siliceous fossil meals (e.g. kieselguhr, tripolite and diatomite) and similar siliceous earths; whether or not calcined, of an apparent specific gravity of 1 or less 1
2513 Pumice stone; emery; natural corundum, natural garnet and other natural abrasives, whether or not heat treated 2
2514 Slate, whether or not roughly trimmed or merely cut, by sawing or otherwise, into blocks or slabs of a rectangular (including square) shape 1
2519 Natural magnesium carbonate (magnesite); fused magnesia; dead-burned (sintered) magnesia, whether or not containing small quantities of other oxides added before sintering; magnesium oxide, pure or not 2
2520 Gypsum; anhydrite; plasters (consisting of calcined gypsum or calcium sulphate), coloured or not, with or without small quantities of accelerators or retarders 2
2521 Limestone flux; limestone and other calcareous stone, of a kind used for the manufacture of lime or cement 1
2528 Natural borates and concentrates thereof (whether or not calcined), but not including borates separated from natural brine; natural boric acid containing not more than 85 % of H3BO3 calculated on the dry weight 1