| 2520 | | Gypsum; anhydrite; plasters (consisting of calcined gypsum or calcium sulfate) whether or not colored, with or without small quantities of accelerators or retarders: | | | | |
| 2521.00.00 | 00 | Limestone flux; limestone and other calcareous stone, of a kind used for the manufacture of lime or cement | t | Free | | Free |
| 2524 | | Asbestos: | | | | |
| 2524.90.00 | 30 | Crudes | t | | | |
| 2524.90.00 | 40 | Milled fibers, group 3 grades (spinning fibers or equivalent) | t | | | |
| 2524.90.00 | 45 | Milled fibers, group 4 and 5 grades | t | | | |
| 2528 | | Natural borates and concentrates thereof (calcined or not), but not including borates separated from natural brine; natural boric acid containing not more than 85 percent of H3BO3 calculated on the dry weight: | | | | |
| 2528.10.00 | 00 | Natural sodium borates and concentrates thereof (whether or not calcined) | kg | Free | | Free |
| 2528.90.00 | 10 | Natural calcium borates | kg | | | |
| 2529.21.00 | 00 | Containing by weight 97 percent or less of calcium fluoride | t | Free | | 13.5% |
| 2530 | | Mineral substances not elsewhere specified or included: | | | | |
| 2530.10.00 | 00 | Vermiculite, perlite and chlorites, unexpanded | kg | Free | | Free |
| 2530.20 | | Kieserite, epsom salts (natural magnesium sulfates): | | | | |
| 2530.20.10 | 00 | Kieserite | kg | Free | | Free |
| 2530.90.20 | 00 | Natural micaceous iron oxides | kg | 2.9% | Free (A,AU,BH,CA, CL,E,IL,J,JO,MA, MX,P,SG) | 20% |
| 2530.90.80 | 10 | Celestite | kg | | | |
| 2601 | | Iron ores and concentrates, including roasted iron pyrites: | | | | |
| 2601.11.00 | | Iron ores and concentrates, other than roasted iron pyrites: | | | | |
| 2601.11.00 | 30 | Concentrates | t | | | |
| 2601.11.00 | 60 | Ores: | | | | |
| 2601.12.00 | 60 | Briquettes | t | | | |
| 2601.20.00 | 00 | Roasted iron pyrites | t | Free | | Free |
| 2602.00.00 | | Manganese ores and concentrates, including ferruginous manganese ores and concentrates with a manganese con- tent of 20 percent or more, calculated on the dry weight | | Free | | 2.2￠/kg on manganese content |
| 2602.00.00 | 40 | Containing less than 47 percent by weight of manganese | kg Mn kg | | | |
| 2602.00.00 | 60 | Containing 47 percent or more by weight of manganese | kg Mn kg | | | |
