| 2505.10 | | Silica sands and quartz sands: | | | | |
| 2506 | | 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: | | | | |
| 2506.10.00 | | Quartz | | Free | | Free |
| 2506.20.00 | | Quartzite | | Free | | Free |
| 6810.99.00 | 10 | Agglomerated quartz slabs of the type used for countertops | m2 | | | |
| 7001.00.10 | 00 | Of fused quartz or other fused silica | kg | Free | | 30% |
| 7002.20.10 | 00 | Of fused quartz or other fused silica | kg | Free | | 40% |
| 7002.31.00 | 00 | Of fused quartz or other fused silica | kg | Free | | 40% |
| 7013.10.10 | 00 | Kitchenware, non-glazed, greater than 75 percent by volume crystalline, of lithium aluminosilicate, having a linear coefficient of expansion not exceeding 10 x 10-7 per Kelvin within a temperature range of 0 degrees C to 300 degrees C, transparent, haze-free, exhibiting transmittances of infrared radiations in excess of 75 percent at a wavelength of 2.5 microns when measured on a sample 3 mm in thickness, and containing beta-quartz solid solution as the predominant crystal phase | No. | 6.9% | Free (A,AU,BH,CA, CL,E,IL,J,JO, MA,MX,P, SG) | 75% |
| 7017.10 | | Of fused quartz or other fused silica: | | | | |
| 7017.10.30 | 00 | Quartz reactor tubes and holders designed for insertion into diffusion and oxidation furnaces for production of semiconductor wafers | X | Free | | 50% |
| 7020.00.30 | 00 | Quartz reactor tubes and holders designed for insertion into diffusion and oxidation furnaces for production of semiconductor wafers | X | Free | | 55% |
| 7104.10.00 | 00 | Piezo-electric quartz | kg | 3% | Free (A,AU,BH,CA, CL,E,IL,J,JO,MA, MX,P,SG) | 50% |
| 8541.60.00 | 10 | Quartz designed for operating frequencies of: | | | | |
Harmonized Tariff Schedule of the United States inquiry: 3203Ã
