| 250900 | -Chalk |
| 251010 | Natural calcium phosphates, natural aluminium calcium phosphates and phosphatic chalk-Unground |
| 251020 | Natural calcium phosphates, natural aluminium calcium phosphates and phosphatic chalk-Ground |
| 251110 | Natural barium sulphate (barytes); natural barium carbonate (witherite), whether or not calcined, other than barium oxide of heading 28.16-Natural barium sulphate (barytes) |
| 251120 | Natural barium sulphate (barytes); natural barium carbonate (witherite), whether or not calcined, other than barium oxide of heading 28.16-Natural barium carbonate (witherite) |
| 251200 | -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 |
| 251310 | Pumice stone; emery; natural corundum, natural garnet and other natural abrasives, whether or not heat-treated:-Pumice stone |
| 251320 | Pumice stone; emery; natural corundum, natural garnet and other natural abrasives, whether or not heat-treated:-Emery, natural corundum, natural garnet and other natural abrasives |
| 251400 | -Slate, whether or not roughly trimmed or merely cut, by sawing or otherwise, into blocks or slabs of a rectangular (including square) shape |
| 251511 | 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-Crude or roughly trimmed |
| 251512 | 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-Merely cut, by sawing or otherwise, into blocks or slabs of a rectangular (including square) shape |
| 251520 | 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-Ecaussine and other calcareous monumental or building stone; alabaster |
| 251611 | 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-Crude or roughly trimmed |
| 251612 | 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-Merely cut, by sawing or otherwise, into blocks or slabs of a rectangular (including square) shape |
| 251620 | 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-Sandstone |
