| Clue | Source | Date |
|---|---|---|
| Some volcanic rocks | Thomas Joseph | 25 Jul 2025 |
| Stones that make up Northern Ireland's Giant's Causeway, e.g | LA Times Daily | 29 Apr 2023 |
| Volcanic rocks | New York Times | 17 Jan 2019 |
| Volcanic rocks | ||
| Some volcanic deposits | ||
| Columnar rocks in Wyoming's Devils Tower | ||
| Columnar rocks in Wyoming's Devils Tower | ||
| Columnar rocks in Wyoming's Devils Tower | ||
| Igneous rocks | ||
| Igneous rocks | ||
| Volcanic rocks | ||
| Some volcanic rocks | ||
| Igneous rocks | ||
| Fine-grained rocks. | ||
| Dark volcanic rocks. |