| Answer | Crossword Clue |
|---|---|
| PUMICE | Rock used for polishing |
| ABRASIVE | Substance used for polishing |
| EMERY | Corundum used for grinding and polishing. |
| SHALE | Rock used for flagstones |
| BASALT | Rock used for statues. |
| NOVACULITE | Rock used for whetstones. |
| STONEAGETOOL | Rock used for hammering, e.g. |
