Section 05 Mineral products 25 Salt, sulphur; earths and stone; plastering materials, lirne and cement 25 05 Natural sands of all kinds, (excl. metal-bearing sands of chapter 26) 25 05 10 Silica sands and quartz sands 25 05 10 00 Silica sands and quartz sands Commodity Code Description 25 05 10 00 00 Silica sands and quartz sands