Section 05 Mineral products 25 Salt; sulphur; earths and stone; plastering materials, lime and cement 25 17 Pebbles, gravel, broken or crushed stone, of a kind commonly used for concrete aggregates, for road metalling or for railway or other ballast, shingle and flint, whether or not heat-treated; macadam of slag, dross or similar industrial waste, whether or n Commodity Code Description 25 17 10 Pebbles,gravel,broken or crushed stone,of a kind commonly used for concrete aggregates 25 17 20 Macadam of slag,dross or similar industrial waste,whether or not incoporating 25 17 30 Tarred macadam 25 17 41 Of marble 25 17 49 Other