| 00078 | Obsidian | 2 Floor S6 c225 |
| 00939 | Ottorelite Schist | 2 Floor S4 c209 |
| 00996 | Oil Shale | 2 Floor S5 c213 |
| 01052 | Olivine Gabbro | 2 Floor S3 c205 |
| 01060 | Ophicalcite | 2 Floor S5 c211 |
| 01061 | Ophicalcite | 2 Floor S5 c211 |
| 01383 | Oolitic Tufa (Dolitic Sinter) | 2 Floor S6 c225 |
| 05461 | Orthoclasite | 1 Floor S 8 148 |
| 13581 | Olivinedorelite | 2 Floor S3 c207 |
| 13892 | Orthogneiss | 2 Floor S4 c209 |
| 14316 | Orbicular Gabbro | 2 Floor S3 c216 |
| 14336 | Oil sand | 2 Floor S5 c212 |
| 19657 | Oolite | 3 Floor S8 309 |