WCO Explanatory Notes reproduced for reference. © World Customs Organization. Verify against official WCO publication.
25.06 - Quartz (other than natural sands); quartzite, whether or not rough1 trimmed or merely cut, by sawing or otherwise, into blocks or dabs of a rectangu ar (including square) shape. i - Quartz 2506.20 - Quartzite 2506.10 Quartz is the naturally occurring crystal form of silica. It falls in this heading only if complying with both of the following two conditions : (a) It must be in the crude state or have not undergone any process be ond that allowed in Note 1 to this Chapter; for this purpose, heat treatment designeI solely to facilitate crushing is regarded as a process perrmtted by Chapter Note 1. (b) It must not be of a variety and quality suitable for the manufacture of gem-stones (e.g., rock crystal and smo quartz, amethyst and rose quartz). Such quartz is excluded (heading 71.03), even i intended to be used for technical purposes, e.g,, as piezo-electric quartz or for the manufacture of parts of tools. "f Quartzite is the name of very hard compact rock composed of grains of quartz agglomerated by a siliceous binder. heading text. The heading also excludes : (a) Natural quartz sand (heading 25.05). (b) Flint or other products of heading 25.17. (c) Optical elements of quartz (heading 90.01).
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.