Section 05 Mineral products 25 Salt; sulphur; earths and stone; plastering materials, lime and cement 25 06 Quartz (other than natural sands); quartzite, whether or not roughly trimmed or merely cut, by sawing or otherwise, into blocks or slabs of a rectangular (including square) shape. Commodity Code Description 25 06 10 Quartz 25 06 20 Quartzite