| Answer | Crossword Clue |
|---|---|
| gabbros | dark granular igneous rock composed essentially of labradorite and augite |
| gabbro | dark granular igneous rock composed essentially of labradorite and augite |
| picrite | granular igneous rock composed chiefly of olivine and augite, but containing small amounts of feldspar |
| diabasic | dark igneous rock consisting essentially of augite and feldspar; altered dolerite |
| diabase | dark igneous rock consisting essentially of augite and feldspar; altered dolerite |
| diabases | dark igneous rock consisting essentially of augite and feldspar; altered dolerite |
