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 a 25 17 10 Mixed Gravel 25 17 10 10 Mixed Gravel Commodity Code Description 25 17 10 10 00 - Pebbles, gravel, broken or crushed stone, of a kind commonly used for concrete aggrega