WCO Explanatory Notes reproduced for reference. © World Customs Organization. Verify against official WCO publication.
25.29 - Feldspar; leucite; nepheline and nepheline syenite; fluorspar. 2529.10 - Feldspar - Fluorspar : - - Containing by weight 97 % or less of calcium fluoride 2529.22 - - Containing by weight more than 97 % of calcium fluoride 2529.30 - Leucite; nepheline and nepheline syenite 2529.21 Feldspar, leucite, nepheline and nepheline s enite are composed of complex silicates of aluminium and alkali or alkaline-earth metals. d e y are used as fluxes in the ceramic industry. The heading excludes feldspathic sands (heading 25.05). Fluorspar (or fluorite) is natural calcium fluoride occurring as solid masses streaked with varied colours or in agglomerated crystals of various colours; it is principally used in the manufacture of hydrofluonc acid and as a flux for metallurgical purposes. The heading also covers fluorspar obtained from the mineral by a heat treatment which causes the product to break u into its constituent particles; as these differ in size, simple screening then permits removal o part of the sllica content. f The heading excludes feldspar or fluorspar in the form of precious or semi-precious stones (Chapter 71). -
1.- Except where their context or Note 4 to this Chapter otherwise requires, the headings of this Chapter cover only products which are in the crude state or which have been washed (even with chemical substances eliminating the impurities without changing the structure of the product), crushed, ground, powdered, levigated, sifted, screened, concentrated by flotation, magnetic separation or other mechanical or physical processes (except crystallisation), but not products which have been roasted, calcined, obtained by mixing or subjected to processing beyond that mentioned in each heading. The products of this Chapter may contain an added anti-dusting agent, provided that such addition does not render the product particularly suitable for specific use rather than for general use. 2.- This Chapter does not cover : (a) Sublimed sulphur, precipitated sulphur or colloidal sulphur (heading 28.02); (b) Earth colours containing 70 % or more by weight of combined iron evaluated as Fe O 2 3 (heading 28.21); (c) Medicaments or other products of Chapter 30; (d) Perfumery, cosmetic or toilet preparations (Chapter 33); (e) Dolomite ramming mix (heading 38.16); (f) Setts, curbstones or flagstones (heading 68.01); mosaic cubes or the like (heading 68.02); roofing, facing or damp course slates (heading 68.03); (g) Precious or semi-precious stones (heading 71.02 or 71.03); (h) Cultured crystals (other than optical elements) weighing not less than 2.5 g each, of sodium chloride or of magnesium oxide, of heading 38.24; optical elements of sodium chloride or of magnesium oxide (heading 90.01); (ij) Billiard chalks (heading 95.04); or (k) Writing or drawing chalks or tailors' chalks (heading 96.09). 3.- Any products classifiable in heading 25.17 and any other heading of the Chapter are to be classified in heading 25.17. 4.- Heading 25.30 applies, inter alia, to : vermiculite, perlite and chlorites, unexpanded; earth colours, whether or not calcined or mixed together; natural micaceous iron oxides; meerschaum (whether or not in polished pieces); amber; agglomerated meerschaum and agglomerated amber, in plates, rods, sticks or similar forms, not worked after moulding; jet; strontianite (whether or not calcined), other than strontium oxide; broken pieces of pottery, brick or concrete.