| Clue | Source | Date |
|---|---|---|
| Basaltic lava ejected as fragments from a volcano (6) | ||
| I have this scar - nothing else - from metal-smelting (6) | ||
| Oscar and I look for lava with steam-holes (6) | ||
| Smelting slag | Premier Sunday | 08 Jul 2018 |
| Dark volcanic rock | New York Times | 20 Apr 2016 |
| Turns up first class mythological birds - it's a release for Etna | Irish Times Crosaire | 16 Jun 2015 |
| Smelting refuse | Wall Street Journal | 22 May 2015 |
| Smelting refuse | ||
| Slag | ||
| Smelting refuse | ||
| Slag | ||
| Smelting residue | ||
| Metal dross | ||
| Foolhardy | ||
| Smelting refuse | ||
| Cellular lava | ||
| Smelting residue | ||
| Smelter slag | ||
| Smelting refuse | ||
| Slag | ||
| Ore slag | ||
| Dross | ||
| Slag. | ||
| Metal refuse. | ||
| Lava. | ||
| Volcanic cinder. | ||
| Slaggy lava. | ||
| Refuse of a smeltery. | ||
| Refuse from melting of metals. | ||
| Leftover of the smelting process. | ||
| Cinders from a volcano. | ||
| Dross; slag. | ||
| Dross. |