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Chalk is a naturally occurring variety of calcium carbonate, composed predominantly of the shells of aquatic micro‑organisms.
The heading does not include :(a) Phosphated chalk (heading 25.10). (b) Steatite or talc (sometimes known as "French chalk" or "Venice chalk") (heading 25.26). (c) Powdered chalk prepared as a dentifrice (heading 33.06). (d) Metal polishes and similar preparations of heading 34.05. (e) Calcium carbonate in powder form, the particles of which are coated with a water‑repellent film of fatty acids (e.g., stearic acid) (heading 38.24). (f) Billiard chalks (heading 95.04). (g) Writing or drawing chalks and tailor's chalks (heading 96.09).
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