| 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: | | | | |
| 2518.10.00 | 00 | Dolomite, not calcined or sintered | t | Free | | Free |
| 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: | | | | |
| 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 |
| 2522 | | Quicklime, slaked lime and hydraulic lime, other than calcium oxide and hydroxide of heading 2825: | | | | |
| 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 | White cement, whether or not artificially colored | t | Free | | $1.76/t, including weight of container |
| 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: | | | | |
| 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￠/kg |
| 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: | | | | |
| 2530.10.00 | 00 | Vermiculite, perlite and chlorites, unexpanded | kg | Free | | Free |
| 2530.20 | | Kieserite, epsom salts (natural magnesium sulfates): | | | | |
| 2601 | | Iron ores and concentrates, including roasted iron pyrites: | | | | |
| 2601.11.00 | | Iron ores and concentrates, other than roasted iron pyrites: | | | | |
| 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 |
| 2606.00.00 | 30 | Bauxite, calcined: | | | | |
| 2615 | | Niobium (columbium), tantalum, vanadium or zirconium ores and concentrates: | | | | |
| 2619.00 | | Slag, dross (other than granulated slag), scalings and other waste from the manufacture of iron or steel: | | | | |
| 2620 | | Slag, ash and residues (other than from the manufacture of iron or steel), containing arsenic, metals or their compounds: | | | | |
| 2620.60 | | Containing arsenic, mercury, thallium or their mixtures, of a kind used for the extraction of arsenic or those metalsor for the manufacture of their chemical compounds: | | | | |
