Sub-Chapter200520062007
Salt (including table salt)$35,436$47,815$17,881
Unroasted iron pyrites.$2,144  
Natural graphite.$190$15$39
Natural sands of all kinds$235$9,250$847
Quartz (other than natural sands); quartzite$7  
Kaolin and other kaolinic clays, whether or not calcined.  $1
Other clays (not including expanded clays of heading 68.06), andalusite, ky ...$3,994$10,924$2,890
Chalk. $182 
Natural calcium phosphates $4,976$4
Siliceous fossil meals$133  
Pumice stone; emery; other natural abrasives$6 $353
Slate $418$71
Marble, travertine, ecaussine and other stone$141$129$199
Granite, porphyry, basalt, sandstone and other stone$10,469$4,335$99
Pebbles, gravel, broken or crushed stone$705$72$57
Natural magnesium carbonate (magnesite)$20 $7
Gypsum; anhydrite; plasters$134$978$37
Limestone flux; limestone$2,980$3,987 
Quicklime, slaked lime and hydraulic lime$6,902$14,524$5,288
Portland cement, aluminous cement, slag cement$498,822$532,728$7,859
Mica, including splitings; mica waste.$67 $78
Natural steatite, whether or not roughly trimmed$16  
Natural borates and concentrates thereof$19  
Mineral substances$17,591$782$3,662
Total$580,011$631,115$39,372