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2501 Salt including table & denatured, pure sodium chloride; sea water 250100 Salt incl tabl a dentrd, pure sodm chlor 2502 Unroasted iron pyrites 250200 Unroasted iron pyrites 2503 Sulfur of all kinds, other than sublimed, precipitated or colloidal sulfur 250310 Sulfur, crude or unrefined 250390 Sulfur, refined, nt sublimed, preciptd or colloidl 2504 Natural graphite 250410 Natural graphite in powder or in flakes 250490 Natural graphite except powder or flakes 2505 Natural sands of all kinds, except metal-bearing 250510 Silica sands and quartz sands, natural 250590 Sands, natural, nesoi 2506 Quartz (other than natural sands); quartzite 250610 Quartz (other than natural sands) 250621 Quartzite, crude or roughly trimmed 250629 Quartzite, other, not crude or roughly trimmed 2507 Kaolin and other kaolinic clays 250700 Kaolin and other kaolinic clays, incl calcined 2508 Other clays, andalusite, kyanite, sillimanite; mullite, chamotte or dinas earths 250810 Bentonite, including calcined 250820 Decolorizing earths and fuller's earth incl calcnd 250830 Fire clay including calcined 250840 Clays nesoi, including ball clays, incl calcined 250850 Andalucite, kyanite and sillimanite 250860 Mullite 250870 Chamotte or dinas earth 2509 Chalk 250900 Chalk 2510 Natural calcium phosphates, natural aluminum calcium phosphates & phosphatic chalk 251010 Ungrnd nat cal phsph, alum cal phos a phos chalk 251020 Nat cal phos, nat al cal phos a phos chlk, ground 2511 Natural barium sulfate; natural barium carbonate not barium oxide barytes, witherite 251110 Natural barium sulfate (barytes) 251120 Natural barium carbonate (witherite) 2512 Siliceous fossil meals & similar siliceous earths of specific gravity of 1 or less kieselguhr, tripolite, diatomite 251200 Siliceous fssl mls a erths w spec grav of 1 o lss 2513 Pumice; emery; natural corundum and garnet & other natural abrasives 251311 Pumice, crude or in irreg pcs incl crushed (abrsve 251319 Pumice, nesoi 251321 Nat abrsvs nesoi crude or in irreg pieces 251329 Nat abrasives excpt pumice, refined 2514 Slate, crude or roughly trimmed 251400 Slate, crude or roughly trimmed 2515 Marble, travertine & other calcareous monumental or building stone of specific gravity of 2.5 or more; alabaster 251511 Marble and travertine, crude or roughly trimmed 251512 Marble and travertine cut in blocks or slabs 251520 Calcrs mnmtl or bldg stone nesoi; alabaster 2516 Granite, porphyry, basalt, sandstone & other monumental or building stone, crude or cut etc. 251611 Granite, crude or roughly trimmed 251612 Granite, cut into blocks or slabs 251621 Sandstone, crude or roughly trimmed 251622 Sandstone, cut into blocks or slabs 251690 Basalt, porphyry and other mnmntl or bldg stone 2517 Pebbles, gravel, brocken or crushed stone; macadam of slag, dross or similar waste 251710 Pebbles, gravel etc. for concrete aggregates etc. 251720 Macadam of slag, dross or similar ind waste 251730 Tarred macadam 251741 Marble granules, chippings and powder 251749 Stone granules, chippings a pwdrs (ex mrbl) nesoi 2518 Dolomite, calcined or not, roughly trimmed etc. 251810 Dolomite not calcined 251820 Calcined dolomite 251830 Agglomerated dolomite (including tarred dolomite) 2519 Natural magnesium carbonate; fused magnesia; dead-burned magnesia; other magnesium oxide magnesite 251910 Natural magnesium carbonate 251990 Fused magnesia; dead-burn magnesia; magnesia nesoi 2520 Gypsum; anhydrite; plasters (consisting of calcium gypsum or sulfate) 252010 Gypsum; anhydrite 252020 Plasters constng of calcnd gypsum or calcm sulfate 2521 Limestone flux; limestone & other calcareous stone used for manufacture of lime & cement 252100 Lmestn flux; lmstn a oth cal sto usd mfr lime, cmt 2522 Quicklime, slaked lime and hydraulic lime 252210 Quicklime 252220 Slaked lime 252230 Hydraulic lime 2523 Cements..portland, aluminous, slag, supersulfate & similar hydraulic cements 252310 Cement clinkers 252321 White portland cement whthr or nt art colored 252329 Portland cement except white portland cement 252330 Aluminous cement 252390 Hydraulic cement, other, nesoi 2524 Asbestos 252400 Asbestos 2525 Mica, including splittings; mica waste 252510 Crude mica and mica rifted into sheets or splttngs 252520 Mica powder 252530 Mica waste 2526 Natural steatite, roughly trimmed or not; talc 252610 Natural steatite and talc, nt crshd, nt pwdrd 252620 Natural steatite and talc, crushed or powdered 2527 Natural cryolite; natural chiolite 252700 Natural cryolite; natural chiolite 2528 Natural borates & concentrates; natural boric acid not more than 85% h3bo3 on dry weight 252810 Natural sodium borates 252890 Natural borates and natural boric acid nesoi 2529 Feldspar; leucite; nepheline, nepheline syenite; fluorspar 252910 Feldspar 252921 Fluorspar contng by wght 97% or under calcm fluord 252922 Fluorspar ov 97 pc calcm fluord by wght 252930 Leucite; nepheline and nepheline syenite 2530 Other mineral substances not specified vermiculite, perlite, chlorites, kieserite, epsom salts, celestite 253010 Vermiculite, perlite and chlorites, unexpanded 253020 Kieserite, epsom salts (natural magnesium sulfate) 253030 Earth colors 253040 Natural micaceous iron oxides 253090 Mineral substances nesoi
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