Heading 2528 — Natural borates and concentrates thereof (whether or not calcined), but not including borates separated from natural brine; natural boric acid containing not more than 85 % of H@3BO@3 calculated on the dry weight

Other headings in Chapter 25

• 2500 —
• 2501 — Salt (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
• 2502 — Unroasted iron pyrites
• 2503 — Sulphur of all kinds, other than sublimed sulphur, precipitated sulphur and colloidal sulphur
• 2504 — Natural graphite
• 2505 — Natural sands of all kinds, whether or not coloured, other than metal-bearing sands of Chapter 26
• 2506 — Quartz (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
• 2507 — Kaolin and other kaolinic clays, whether or not calcined
• 2508 — Other clays (not including expanded clays of heading 6806), andalusite, kyanite and sillimanite, whether or not calcined; mullite; chamotte or dinas earths
• 2509 — Chalk
• 2510 — Natural calcium phosphates, natural aluminium calcium phosphates and phosphatic chalk
• 2511 — Natural barium sulphate (barytes); natural barium carbonate (witherite), whether or not calcined, other than barium oxide of heading 2816
• 2512 — 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
• 2513 — Pumice stone; emery; natural corundum, natural garnet and other natural abrasives, whether or not heat-treated
• 2514 — Slate, whether or not roughly trimmed or merely cut, by sawing or otherwise, into blocks or slabs of a rectangular (including square) shape
• 2515 — Marble, travertine, ecaussine 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 square) shape
• 2516 — Granite, 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
• 2517 — Pebbles, 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 not incorporating the materials cited in the first part of the heading; tarred macadam; granules, chippings and powder, of stones of heading 2515 or 2516, whether or not heat-treated
• 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 sulphate) whether or not coloured, with or without small quantities of accelerators or retarders
• 2521 — Limestone flux; limestone and other calcareous stone, of a kind used for the manufacture of lime or cement
• 2522 — Quicklime, slaked lime and hydraulic lime, other than calcium oxide and hydroxide of heading 2825
• 2523 — Portland cement, aluminous cement, slag cement, supersulphate cement and similar hydraulic cements, whether or not coloured or in the form of clinkers
• 2524 — Asbestos
• 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 rectangular (including square) shape; talc
• 2528 (current)
• 2529 — Feldspar; leucite; nepheline and nepheline syenite; fluorspar
• 2530 — Mineral substances not elsewhere specified or included