| Clue | Source | Date |
|---|---|---|
| Black or greenish- black mineral found ingenious and metamorphic rocks (10) | ||
| Black or greenish-black mineral found in igneous and metamorphic rocks | Mirror Quiz | 18 Jan 2025 |
| Black or greenish-black mineral found in igneous and metamorphic rocks | Mirror Quiz | 21 Apr 2024 |
| He pens new book to contribute on gold mineral | ||
| Black or greenish-black rock-forming mineral | The Telegraph General Knowledge | 30 Apr 2017 |
| Green to black mineral | ||
| Aluminous mineral | ||
| Amphibole |