| 2518 | | Dolomite whether or not calcined or sintered, including dolomite roughly trimmed or merely cut, by sawing or otherwise, into blocks or slabs of a rectangular (including square) shape; dolomite ramming mix: | | | | |
| 2519 | | Natural magnesium carbonate (magnesite); fused magnesia; dead-burned (sintered) magnesia, whether or not containing small quantities of other oxides added before sintering; other magnesium oxide, whether or not pure: | | | | |
| 2520 | | Gypsum; anhydrite; plasters (consisting of calcined gypsum or calcium sulfate) whether or not colored, with or without small quantities of accelerators or retarders: | | | | |
| 2520.10.00 | 00 | Gypsum; anhydrite | t | Free | | Free |
| 2520.20.00 | 00 | Plasters | t | Free | | $1.38/t |
| 2523 | | Portland cement, aluminous cement, slag cement, supersulfate cement and similar hydraulic cements, whether or not colored or in the form of clinkers: | | | | |
| 2523.21.00 | 00 | Portland cement: | | | | |
| 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 | | | |
| 2525 | | Mica, including splittings; mica waste: | | | | |
| 2525.10.00 | | Crude mica and mica rifted into sheets or splittings | | Free | | Free |
| 2525.10.00 | 10 | Split block mica | kg | | | |
| 2525.10.00 | 20 | Mica splittings | kg | | | |
| 2525.20.00 | 00 | Mica powder | kg | Free | | 20% |
| 2526 | | Natural steatite, whether or not roughly trimmed or merely cut, by sawing or otherwise, into blocks or slabs of a rect- angular (including square) shape;talc: | | | | |
| 2526.10.00 | 00 | Not crushed, not powdered | kg | Free | | 0.6¡é/kg |
| 2526.20.00 | 00 | Crushed or powdered | t | Free | | 35% |
| 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: | | | | |
| 2529 | | Feldspar; leucite, nepheline and nepheline syenite; fluorspar: | | | | |
| 2529.10.00 | 00 | Feldspar | t | Free | | 49¡é/t |
| 2529.21.00 | 00 | Fluorspar: | | | | |
| 2529.21.00 | 00 | Containing by weight 97 percent or less of calcium fluoride | t | Free | | 13.5% |
| 2529.22.00 | 00 | Containing by weight more than 97 percent of calcium fluoride | t | Free | | $5.51/t |
| 2529.30.00 | | Leucite; nepheline and nepheline syenite | | Free | | Free |
| 2529.30.00 | 10 | Nepheline syenite | t | | | |
