| Answer | Crossword Clue |
|---|---|
| FELDSPAR | Important constituent of igneous rocks |
| MICA | Constituent of igneous rocks. |
| FELDSPAR | Igneous rock constituent |
| LAVA | Source of igneous rocks |
| PERIDOTITES | Groups of igneous rocks. |
| BASALTS | Igneous rocks |
| GRANITES | Igneous rocks. |
| SIALS | Igneous rocks |
| SIMAS | Igneous rocks |
| MAGMA | Igneous rocks, once |
| SYENITES | Certain igneous rocks. |
| GABBROS | Granular igneous rocks. |
| MAGMA | Igneous rock's source |
| LENAD | Mineral in igneous rocks. |
| PYROXENE | Mineral found in igneous rocks |
| MICA | Mineral found in igneous, sedimentary, and metamorphic rocks |
