2501Salt (including table salt and denatured salt) and pure sodium chloride, whether or not in aqueous solution or containing added anti-caking or free-flowing agents; sea water
2502Unroasted iron pyrites
2503Sulfur of all kinds, other than sublimed sulfur, precipitated sulfur and colloidal sulfur
2504Natural graphite:
2505Natural sands of all kinds, whether or not colored, other than metalbearing sands of chapter 26:
2506Quartz (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:
2507Kaolin and other kaolinic clays, whether or not calcined
2508Other clays (not including expanded clays of heading 6806), andalusite, kyanite and sillimanite, whether or not calcined; mullite; chamotte or dinas earths:
2509Chalk:
2510Natural calcium phosphates, natural aluminum calcium phosphates and phosphatic chalk:
2511Natural barium sulfate (barytes); natural barium carbonate (witherite), whether or not calcined, other than barium oxide of heading 2816:
2512Siliceous 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
2513Pumice; emery; natural corundum, natural garnet and other natural abrasives, whether or not heat-treated:
2514Slate, whether or not roughly trimmed or merely cut, by sawing or otherwise, into blocks or slabs of a rectangular (including square) shape
2515Marble, travertine and other calcareous monumental or building stone of an apparent specific gravity of 2.5 or more, and alabaster, whether or not roughly trimmed or merely cut, by sawing or otherwise, into blocks or slabs of a rectangular (including squa
2516Granite, porphyry, basalt, sandstone and other monumental or building stone, whether or not roughly trimmed or merely cut, by sawing or otherwise, into blocks or slabs of a rectangular (including square) shape:
2517Pebbles, gravel, broken or crushed stone, of a kind commonly used for concrete aggregates, for road metalling, or for railway or other ballast; shingle and flint, whether or not heat-treated; macadam of slag, dross or similar industrial waste, whether or
2518Dolomite 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:
2519Natural 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:
2520Gypsum; anhydrite; plasters (consisting of calcined gypsum or calcium sulfate) whether or not colored, with or without small quantities of accelerators or retarders:
2521Limestone flux; limestone and other calcareous stone, of a kind used for the manufacture of lime or cement
2522Quicklime, slaked lime and hydraulic lime, other than calcium oxide and hydroxide of heading 2825:
2523Portland cement, aluminous cement, slag cement, supersulfate cement and similar hydraulic cements, whether or not colored or in the form of clinkers:
2524Asbestos:
2525Mica, including splittings; mica waste:
2526Natural steatite, whether or not roughly trimmed or merely cut, by sawing or otherwise, into blocks or slabs of a rectangular (including square) shape; talc:
2528Natural borates and concentrates thereof (whether or not calcined), but not including borates separated from natural brine; natural boric acid containing not more than 85 percent of H3BO3 calculated on the dry weight
2529Feldspar; leucite, nepheline and nepheline syenite; fluorspar:
2530Mineral substances not elsewhere specified or included:


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