| 2504.10 | | In powder or in flakes: | | | | |
| 2504.10.10 | 00 | Crystalline flake (not including flake dust) | kg | Free | | 3.6¢/kg |
| 2504.10.50 | 00 | Other | kg | Free | | 10% |
| 2504.90.00 | 00 | Other | kg | Free | | 10% |
| 2505 | | Natural sands of all kinds, whether or not colored, other than metal-bearing sands of chapter 26: | | | | |
| 2505.10 | | Silica sands and quartz sands: | | | | |
| 2505.10.10 | 00 | Sand containing by weight 95 percent or more of silica and not more than 0.6 percent of oxide of iron | t | Free | | $1.97/t |
| 2505.10.50 | 00 | Other | t | Free | | Free |
| 2505.90.00 | 00 | Other | t | Free | | Free |
| 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 |
| 2506.10.00 | 10 | Sands (other than natural) containing by weight 95 percent or more of silica and not more than 0.6 percent of oxide of iron | t | | | |
| 2506.10.00 | 50 | Other | t | | | |
| 2506.20.00 | | Quartzite | | Free | | Free |
| 2506.20.00 | 10 | Crude or roughly trimmed | t | | | |
| 2506.20.00 | 80 | Other | t | | | |
| 2507.00.00 | 00 | Kaolin and other kaolinic clays, whether or not calcined | t | Free | | $2.46/t |
| 2508 | | Other clays (not including expanded clays of heading 6806), andalusite, kyanite and sillimanite, whether or not calcined; mullite; chamotte or dinas earths: | | | | |
| 2508.10.00 | 00 | Bentonite | t | Free | | $3.20/t |
| 2508.30.00 | 00 | Fire-clay | t | Free | | $1.97/t |
| 2508.40.01 | | Other clays | | Free | | $1.97/t |
| 2508.40.01 | 10 | Common blue clay and other ball clays | t | | | |
| 2508.40.01 | 20 | Decolorizing earths and fuller's earth | t | | | |
| 2508.40.01 | 50 | Other | t | | | |
| 2508.50.00 | 00 | Andalusite, kyanite and sillimanite | t | Free | | Free |
Harmonized Tariff Schedule of the United States inquiry: 3203Ã
