| Answer | Crossword Clue |
|---|---|
| SLATY | Like a fine-grained rock |
| SHALE | Fine-grained rock |
| SLATE | Fine-grained rock |
| BASALT | Fine-grained rock |
| CHERT | Fine-grained rock |
| BASALT | Fine-grained rock. |
| SHALE | Fine-grained rock. |
| SHALE | Fine-grained sedimentary rock |
| BASALT | Dark fine-grained rock. |
