| Answer | Crossword Clue |
|---|---|
| porphyry | A hard igneous rock containing crystals, usually of feldspar, in a fine-grained, typically reddish groundmass |
| porphyries | A hard igneous rock containing crystals, usually of feldspar, in a fine-grained, typically reddish groundmass |
| porphyritic | Relating to or denoting a rock texture, typically found in volcanic rocks, containing distinct crystals or crystalline particles embedded in a fine-grained groundmass |
| granophyre | A granitic rock consisting of intergrown feldspar and quartz crystals in a medium- to fine-grained groundmass |
| groundmasses | GROUNDMASS, the fine-grained part of an igneous rock, in which the larger crystals are embedded |
