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| Sub-Chapter | 2005 | 2006 | 2007 | 2008 |
| Unroasted iron pyrites. | | | $7,568 | |
| Natural sands of all kinds | | | | $10,514 |
| Quartz (other than natural sands); quartzite | | | | $19 |
| Other clays (not including expanded clays of heading 68.06), andalusite, ky ... | | $477 | $637 | |
| Chalk. | $20,182 | | | |
| Pumice stone; emery; other natural abrasives | | | $4,729 | $8,890 |
| Slate | | | $2,159 | |
| Granite, porphyry, basalt, sandstone and other stone | | $33,181 | | $2,005 |
| Pebbles, gravel, broken or crushed stone | | $4,583 | $4,956 | |
| Gypsum; anhydrite; plasters | $2,327 | | | |
| Total | $22,509 | $38,241 | $20,049 | $21,428 |
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