| 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 |
| 2508.10.00 | 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 |
| 2508.60.00 | 00 | Mullite | t | Free | | 30% |
| 2508.70.00 | 00 | Chamotte or dinas earth | t | Free | | Free |
| 2509.00.10 | 00 | Crude | t | Free | | Free |
| 2509.00.20 | 00 | Other | t | Free | | 13% |
| 2510.10.00 | 00 | Unground | t | Free | | Free |
| 2510.20.00 | 00 | Ground | t | Free | | Free |
| 2511.10.10 | 00 | Ground | t | Free | | $7.38/t |
| 2511.10.50 | 00 | Other | t | $1.25/t | Free (A,AU,BH,CA, CL,E,IL,J,JO,MA, MX,P,SG) | $3.94/t |
| 2512.00.00 | 00 | Siliceous fossil meals (for example, kieselguhr, tripolite and diatomite) and similar siliceous earths, whether or not calcined, of an apparent specific gravity of 1 or less | t | Free | | Free |
| 2513.10.00 | 80 | Other | kg | | | |
| 2513.10.00 | | Pumice stone | | Free | | Free |
| 2513.10.00 | 10 | Crude or in irregular pieces, including crushed pumice | kg | | | |
| 2513.20.10 | 00 | Crude or in irregular pieces | kg | Free | | Free |
| 2513.20.90 | 00 | Other | kg | Free | | 2.2￠/kg |
