| Clue | Source | Date |
|---|---|---|
| Titanium dioxide | ||
| To satisfy, PPE must be natural mineral | ||
| Mineral form of titanium dioxide | The Telegraph General Knowledge | 14 Dec 2020 |
| Crystalline form of titanium dioxide | ||
| Crystalline form of titanium dioxide | ||
| Pigment for paints | ||
| Octahedrite, a mineral. | ||
| Octahedrite. | ||
| Mineral used in paints. |