25 Salt; sulphur; earths, stone; plastering materials, lime and cement
2517 Pebbles, gravel, crushed stone for concrete aggregates for road or railway ballast, shingle or flint; macadam of slag, dross etc tarred granules, chippings, powder of stones of heading no. 2515 and 2516
2517.49Of heading no. 2515 or 2516 (excluding marble), in granules, chippings and powder, whether or not heat-treated