Sub-Chapter2005200620072008
Salt (including table salt)$56,128$91,580$72,669$76,941
Natural graphite.   $99
Natural sands of all kinds$33,350$71,526$102,367$207,355
Kaolin and other kaolinic clays, whether or not calcined.$49   
Other clays (not including expanded clays of heading 68.06), andalusite, ky ...$11,788$1,786$5,379$5,100
Chalk.$1,195$922$115$912
Natural calcium phosphates$76$24$65 
Pumice stone; emery; other natural abrasives$1,399 $166$205
Slate   $536
Marble, travertine, ecaussine and other stone$2,415$10,770 $741
Granite, porphyry, basalt, sandstone and other stone$148$2,242$8,624$18,877
Pebbles, gravel, broken or crushed stone$1,222$164,276$244,709$202,277
Dolomite, whether or not calcined or sintered$1,415   
Natural magnesium carbonate (magnesite)   $3,681
Gypsum; anhydrite; plasters$3,675$27,964$42,604$55,891
Limestone flux; limestone$104   
Quicklime, slaked lime and hydraulic lime$57,240$11,911$24 
Portland cement, aluminous cement, slag cement$3,163,939$4,400,972$4,922,040$6,118,475
Mica, including splitings; mica waste.  $779 
Natural steatite, whether or not roughly trimmed  $368 
Natural borates and concentrates thereof$76$435 $111
Mineral substances$2,642$33$81$2,157
Total$3,336,861$4,784,441$5,399,990$6,693,358