In crystallography, a ”dome” is a crystal form that typically consists of two non-parallel faces related by a mirror plane. This description matches option (D), where the two non-parallel faces are symmetrically related by a mirror plane. The other options describe different symmetry relationships
| Group I | Group II |
| P. Sillimanite | 1. First order |
| Q. Quartz | 2. Second order |
| R. Muscovite | 3. Greater than third order |
| S. Calcite | 4. Third order variegated |
| Group I | Group II |
| P. Bababudan Group | 1. Eastern Dharwar |
| Q. Banded Gneissic Complex-I | 2. Western Dharwar |
| R. Bonai Granite | 3. Aravalli |
| S. Kolar Group | 4. Singhbhum |