| Answer | Crossword Clue |
|---|---|
| EMERY | Dark, granular rock |
| TONALITE | Granular igneous rock. |
| ONYX | Dark rock |
| APHANITE | Dark rock |
| BASALT | Dark rock |
| BASALT | Dark igneous rock. |
| DIABASE | Dark igneous rock |
| BASALT | Dark volcanic rock |
| BASALT | Dark, dense rock. |
| BASALT | Dark-colored volcanic rock. |
| GOTH | Dark style of rock |
| BASALT | Dark fine-grained rock. |
| BASALTIC | Like dark igneous rock |
| URALITE | Dark-green rock, in mineralogy. |
| BASALTIC | Of a dark, volcanic rock |
| BASALT | Dark rock of a lava flow. |
