Siliceous fossil meals (for example, kieselguhr, tripolite and diatomite) and similar siliceous earths, whether or not calcined, of an apparent specific gravity of 1 or less.

1. 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...

2. 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 203 (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...

3. 3. Any products classifiable in heading 25.17 and any other heading of the Chapter are to be classified in heading 25.17.

4. 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.