| Answer | Crossword Clue |
|---|---|
| groundmass | The compact, finer-grained material in which the crystals are embedded in a porphyritic rock |
| groundmass | the fine-grained part of an igneous rock, in which the larger crystals are embedded |
| groundmasses | GROUNDMASS, the fine-grained part of an igneous rock, in which the larger crystals are embedded |
| porphyritic | designating an igneous rock in which large crystals (phenocrysts) are set in a matrix of relatively finer-grained crystals or of glass |
| matrixes | A mass of fine-grained rock in which gems, crystals, or fossils are embedded |
