Material Index
| Name | Formula | Classifications | Members | Image | Lines | Spectra | Techniques | Tags |
|---|---|---|---|---|---|---|---|---|
| Orthopyroxene | (Mg,Mn,Fe)SiO3 | Pyroxene | Donpeacorite, Ferrosilite, Protoenstatite, Enstatite | 0 | 0 | — | Silicate, Subgroup | |
| Osmium | Os | — | — | 16 | 1 | SXES | Metal , Mineral , Element | |
| Osumilite | KFe2Al3(Al2Si10)O30 | Osumilite (group) | — | 0 | 0 | — | Mineral, Aluminosilicate | |
| Osumilite (group) | — | — | Osumilite-(Mg), Sogdianite, Friedrichbeckeite, Roedderite, Laurentthomasite, Berezanskite, Brannockite, Osumilite, Aluminosugilite, Oftedalite, Agakhanovite-(Y), Poudretteite, Chayesite, Eifelite, Trattnerite, Merrihueite, Almarudite, Klöchite, Dusmatovite, Milarite, Shibkovite, Darapiosite, Sugilite, Yagiite, Armenite | 0 | 0 | — | Group | |
| Osumilite-(Mg) | KMg2Al3(Al2Si10)O30 | Osumilite (group) | — | 0 | 0 | — | Mineral, Aluminosilicate | |
| Otavite | CdCO3 | Calcite (group) | — | 1 | 0 | — | Mineral, Carbonate | |
| Oxy-chromium-dravite | NaCr3(Cr4Mg2)(Si6O18)(BO3)3(OH)3O | Tourmaline | — | 0 | 0 | — | Mineral, Hydroxide , Borate | |
| Oxy-dravite | Na(Al2Mg)(Al5Mg)(Si6O18)(BO3)3(OH)3O | Tourmaline | — | 0 | 0 | — | Mineral, Hydroxide , Borate , Aluminosilicate | |
| Oxy-foitite | ☐(FeIIAl2)Al6(Si6O18)(BO3)3(OH)3O | Tourmaline | — | 0 | 0 | — | Mineral, Hydroxide , Borate , Aluminosilicate | |
| Oxy-schorl | Na(FeII2Al)Al6(Si6O18)(BO3)3(OH)3O | Tourmaline | — | 0 | 0 | — | Mineral, Hydroxide , Borate , Aluminosilicate | |
| Oxy-vanadium-dravite | NaV3(V4Mg2)(Si6O18)(BO3)3(OH)3O | Tourmaline | — | 0 | 0 | — | Mineral, Hydroxide , Borate | |
| Oxybismutomicrolite | (Bi1.33☐0.67)Σ2Ta2O6O | Microlite (group) | — | 0 | 0 | — | Mineral | |
| Oxycalciomicrolite | Ca2Ta2O7 | Calcium tantalate, Microlite (group) | — | 0 | 0 | — | Mineral | |
| Oxycalciopyrochlore | Ca2Nb2O6O | Pyrochlore (group) | — | 0 | 0 | — | Mineral, Niobate | |
| Oxycalcioroméite | Ca2SbV2O7 | Roméite (group) | — | 0 | 0 | — | Mineral |
