| Answer | Crossword Clue |
|---|---|
| ophitic | diabase in which elongate crystals of plagioclase are embedded in pyroxene |
| ophite | diabase in which elongate crystals of plagioclase are embedded in pyroxene |
| ophites | diabase in which elongate crystals of plagioclase are embedded in pyroxene |
| groundmass | The compact, finer-grained material in which the crystals are embedded in a porphyritic rock |
