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Notes.
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 Fe2O3 (heading 28.21); (c) Medicaments or other products of Chapter 30; (d) Perfumery, cosmetic or toilet preparations (Chapter 33); (e) Setts, curbstones or flagstones (heading 68.01); mosaic cubes or the like (heading 68.02); roofing, facing or damp course slates (heading 68.03); (f) Precious or semi‑precious stones (heading 71.02 or 71.03); (g) 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); (h) Billiard chalks (heading 95.04); or (ij) 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. GENERAL
As provided in Note 1, this Chapter covers, except where the context otherwise requires, mineral products only in the crude state or washed (including washing with chemical substances to eliminate impurities provided that the structure of the product itself is not changed), crushed, ground, powdered, levigated, sifted, screened or concentrated by flotation, magnetic separation or other mechanical or physical processes (not including crystallisation). The products of this Chapter may also be heated to remove moisture or impurities or for other purposes, provided that the heat treatment does not modify their chemical or crystalline structures. However, other heat treatments (e.g., roasting, fusion or calcination) are not allowed, unless specifically permitted by the heading text. Thus, for example, heat treatment which could entail a change in chemical or crystalline structure is allowed for products of headings 25.13 and 25.17, because the texts of these headings explicitly refer to heat treatment.
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. Minerals which have been otherwise processed (e.g., purified by re‑crystallisation, obtained by mixing minerals falling in the same or different headings of this Chapter, made up into articles by shaping, carving, etc.) generally fall in later Chapters (for example, Chapter 28 or 68).
In certain cases, however, the headings : (1) Refer to goods which by their nature must have been subjected to a process not provided for by Note 1 to this Chapter. Examples include pure sodium chloride (heading 25.01), certain forms of refined sulphur (heading 25.03), chamotte earth (heading 25.08), plasters (heading 25.20), quicklime (heading 25.22) and hydraulic cements (heading 25.23). (2) Specify conditions or processes which are admissible in those cases in addition to those allowed generally under Note 1 to this Chapter. For example, witherite (heading 25.11), siliceous fossil meals and similar siliceous earths (heading 25.12) and dolomite (heading 25.18) may be calcined; magnesite and magnesia (heading 25.19) may be fused or calcined (dead‑burned (sintered) or caustic‑burned). In the case of dead‑burned (sintered) magnesia, other oxides (e.g., iron oxide, chromium oxide) may have been added to facilitate sintering. Similarly the materials of headings 25.06, 25.14, 25.15, 25.16, 25.18 and 25.26 may be roughly trimmed or merely cut, by sawing or otherwise, into blocks or slabs of a rectangular (including square) shape.
When products are classifiable in heading 25.17 and any other heading of this Chapter, they are to be classified in heading 25.17.
The Chapter excludes precious or semi‑precious stones of Chapter 71.
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