Material Index
| Name | Formula | Classifications | Members | Image | Lines | Spectra | Techniques | Tags |
|---|---|---|---|---|---|---|---|---|
| Oxygen | O | — | — | 2 | 0 | — | Element | |
| Oxynatromicrolite | (Na,Ca,U)2(Ta,Nb)2O6(O,F) | Microlite (group) | — | 0 | 0 | — | Mineral, Halide | |
| Oxyphlogopite | K(Mg,Ti,Fe)3[(Si,Al)4O10](O,F)2 | Biotite | — | 0 | 0 | — | Mineral, Aluminosilicate , Halide | |
| Oxyplumboroméite | Pb2Sb2O7 | Roméite (group) | — | 0 | 0 | — | Mineral | |
| Oxystannomicrolite | Sn2Ta2O6O | Microlite (group) | — | 0 | 0 | — | Mineral | |
| Oxystibiomicrolite | (SbIII,Ca)2Ta2O6O | Microlite (group) | — | 0 | 0 | — | Mineral |