Beginning with O.
- O'DanieliteNa◻ZnZn2(AsO4)[AsO3(OH)]2Mineralphosphate
- OakstoneBaSO4Variety—
- OberthüriteRh3Ni32S32Mineralsulfide
- OberwolfachiteSrFe3+3(AsO4)(SO4)(OH)6Mineralphosphate
- OboniobiteMg4Nb2O9Mineraloxide
- Obradovicite-KCu[K2(H2O)17Cu(H2O)6][Mo8As2Fe3+3O34(OH)3]Mineralsulfate
- Obradovicite-NaCu[Na2(H2O)17Cu(H2O)6][Mo8As2Fe3+3O34(OH)3]Mineralsulfate
- Obradovicite-NaNa[Na2(H2O)16Na(H2O)6][Mo8As2Fe3+3O33(OH)4]Mineralsulfate
- OdigitriaiteCsNa5Ca5[Si14B2O38]F2Mineralsilicate
- OdikhinchaiteNa9Sr3[(H2O)2Na]Ca6Mn3Zr3NbSi(Si24O72)O(OH)3(CO3) · H2OMineralsilicate
- Odinite(Fe3+,Mg,Al,Fe2+)2.5(Si,Al)2O5(OH)4Mineralsilicate
- OdintsoviteK2Na4Ca3Ti2Be4Si12O38Mineralsilicate
- OellacheriteKAl2(AlSi3O10)(OH)2Variety—
- OeniteCoSbAsMineralsulfide
- OffretiteKCaMg(Si13Al5)O36 · 15H2OMineralsilicate
- OftedaliteK(ScCa)◻2Be3Si12O30Mineralsilicate
- OgdensburgiteCa2Fe3+4Zn(AsO4)4(OH)6 · 6H2OMineralphosphate
- OgnititeNiBiTeMineralsulfide
- OhmiliteSr3(Ti,Fe3+)(Si2O6)2(O,OH) · 2H2OMineralsilicate
- Ohtaniite Mg3(Si0.5◻0.5)Si2O8Mineralsilicate
- Oil QuartzSiO2Variety—
- OjuelaiteZnFe3+2(AsO4)2(OH)2 · 4H2OMineralphosphate
- Okanoganite-(Y)(Y,REE,Ca,Na,Th)16(Fe3+,Ti)(Si,B,P)10(O,OH)38F10Mineralsilicate
- OkayamaliteCa2B2SiO7Mineralsilicate
- OkeniteCa10Si18O46 · 18H2OMineralsilicate
- OkhotskiteCa2Mn2+Mn3+2(Si2O7)(SiO4)(OH)2 · H2OMineralsilicate
- OkieiteMg3[V10O28] · 28H2OMineraloxide
- OkruginiteCu2SnSe3Mineralsulfide
- OkruschiteCa2Mn2+5Be4(AsO4)6(OH)4 · 6H2OMineralphosphate
- OldhamiteCaSMineralsulfide
- Oldsite-(K)K2Fe2+[(UO2)(SO4)2]2(H2O)8Mineralsulfate
- OlekminskiteSr2(CO3)2Mineralcarbonate
- OleniteNaAl3Al6(Si6O18)(BO3)3O3(OH)Mineralsilicate
- OlgafrankiteNi3GeMineralsulfide
- Olgite(Ba,Sr)(Na,Sr,REE)2Na(PO4)2Mineralphosphate
- Oligoclase(Na,Ca)[Al(Si,Al)Si2O8]Variety—
- Oligoclase-AlbiteNa(AlSi3O8)Variety—
- Oligonite(Fe,Mn)CO3Variety—
- OliveniteCu2(AsO4)(OH)Mineralphosphate
- OlkhonskiteCr2Ti3O9Mineraloxide
- OlmiiteCaMn[SiO3(OH)](OH)Mineralsilicate
- OlmsteaditeKFe2+2NbO2(PO4)2 · 2H2OMineralphosphate
- OlsacheritePb2(Se6+O4)(SO4)Mineralsulfate
- OlseniteKFe4(PO4)3Mineralphosphate
- OlshanskyiteCa2[B3O3(OH)6]OH · 3H2OMineral—
- OlympiteLiNa5(PO4)2Mineralphosphate
- OmariniiteCu8Fe2ZnGe2S12Mineralsulfide
- OmeiiteOsAs2Mineralsulfide
- OmineliteFe2+Al3O2(BO3)(SiO4)Mineralsilicate
- OmongwaiteNa2Ca5(SO4)6 · 3H2OMineralsulfate
- Omphacite(Ca,Na)(Mg,Fe,Al)Si2O6Mineralsilicate
- OmsiteNi2Fe3+(OH)6[Sb(OH)6]Mineraloxide
- OndrušiteCaCu4(AsO4)2(AsO3OH)2 · 10H2OMineralphosphate
- OneilliteNa15Ca3Mn3Fe3Zr3Nb(Si25O73)(O,OH,H2O)3(OH,Cl)2Mineralsilicate
- OnoratoiteSb8O11Cl2Mineralhalide
- OnyxSiO2Variety—
- Onyx OpalVariety—
- Oosterboschite(Pd,Cu)7Se5Mineralsulfide
- OotanniteTh4+2W6+4O16·5H2OMineralsulfate
- OpalSiO2 · nH2OMineraloxide
- Opal MatrixVariety—
- Opal-AVariety—
- Opal-AGSiO2·nH2OVariety—
- Opal-AgateSiO2·nH2OVariety—
- Opal-ANSiO2·nH2OVariety—
- Opal-CSiO2·nH2OVariety—
- Opal-CTSiO2·nH2OVariety—
- Opal-JasperSiO2·nH2OVariety—
- OpalineSiO2·nH2OVariety—
- OphiriteCa2Mg4[Zn2Mn3+2(H2O)2(Fe3+W9O34)2] · 46H2OMineralsulfate
- OppenheimeriteNa2(UO2)(SO4)2 · 3H2OMineralsulfate
- OrangiteTh(SiO4)Variety—
- OrceliteNi5-xAs2 (x = 0.25)Mineralsulfide
- OrdoñeziteZnSb5+2O6Mineraloxide
- ÖrebroiteMn2+6(Sb5+Fe3+)(SiO4)2O6Mineralsilicate
- Oregon SunstoneCa(Al2Si2O8)Variety—
- OregoniteFeNi2As2Mineralsulfide
- OreillyiteCr2NMineralnative
- Organovaite-MnK2MnNb4(Si4O12)2O4 · 5-7H2OMineralsilicate
- Organovaite-ZnK2Zn(Nb,Ti)4(Si4O12)2(O,OH)4 · 6H2OMineralsilicate
- OrickiteCuFeS2 · nH2OMineralsulfide
- OrientiteCa8Mn3+10(SiO4)3(Si3O10)3(OH)10 · 4H2OMineralsilicate
- OrishchiniteNi2PMineralnative
- OrlandiitePb3Cl4(Se4+O3) · H2OMineraloxide
- OrletsCaMn3Mn(Si5O15)Variety—
- OrloviteKLi2Ti(Si4O10)(OF)Mineralsilicate
- OrlymaniteCa4Mn2+3Si8O20(OH)6 · 2H2OMineralsilicate
- OrpimentAs2S3Mineralsulfide
- OrschalliteCa3(S4+O3)2(SO4) · 12H2OMineraloxide
- OrthobranneriteU4+U6+Ti4O12(OH)2Mineraloxide
- OrthoclaseK(AlSi3O8)Mineralsilicate
- OrthocuproplatinumPt3CuMineralnative
- OrthogersdorffiteNiAsSMineralsulfide
- Orthojoaquinite-(Ce)NaBa2Fe2+Ce2Ti2(SiO3)8O2(O,OH) · H2OMineralsilicate
- Orthojoaquinite-(La)NaBa2Fe2+La2Ti2(SiO3)8O2(OH,O,F) · H2OMineralsilicate
- OrthominasragriteV4+O(SO4) · 5H2OMineralsulfate
- OrthopinakioliteMg2Mn3+O2(BO3)Mineral—
- OrthoserpieriteCaCu4(SO4)2(OH)6 · 3H2OMineralsulfate
- Orthowalpurgite(UO2)Bi4O4(AsO4)2 · 2H2OMineralphosphate
- OsakaiteZn4(SO4)(OH)6 · 5H2OMineralsulfate
- OsarizawaitePb(Al2Cu2+)(SO4)2(OH)6Mineralsulfate
- OsarsiteOsAsSMineralsulfide
- OsborniteTiNMineralnative
- OscarkempffiteAg10Pb4(Sb17Bi9)S48Mineralsulfide
- OskarssoniteAlF3Mineralhalide
- OsumiliteKFe2(Al5Si10)O30Mineralsilicate
- Osumilite-(Mg)KMg2Al3(Al2Si10)O30Mineralsilicate
- Oswaldpeetersite(UO2)2(CO3)(OH)2 · 4H2OMineralcarbonate
- OtaviteCd(CO3)Mineralcarbonate
- OtjisumeitePbGe4O9Mineralsilicate
- OttemanniteSn2S3Mineralsulfide
- OttensiteNa3(Sb2O3)3(SbS3) · 3H2OMineralsulfide
- OttohahniteNa6(UO2)2(SO4)5(H2O)7 · 1.5H2OMineralsulfate
- OttoitePb2TeO5Mineralsulfate
- OttréliteMn2+Al2O(SiO4)(OH)2Mineralsilicate
- OtwayiteNi2(CO3)(OH)2 · H2OMineralcarbonate
- OulankaitePd5Cu4SnTe2S2Mineralsulfide
- OurayiteAg3Pb4Bi5S13Mineralsulfide
- OursiniteCo(UO2)2(SiO3OH)2 · 6H2OMineralsilicate
- OvamboiteCu10Fe3WGe3S16Mineralsulfide
- OveriteCaMgAl(PO4)2(OH) · 4H2OMineralphosphate
- Owensite(Ba,Pb)6(Cu1+,Fe,Ni)25S27Mineralsulfide
- Owyhee JasperSiO2Variety—
- OwyheeiteAg3Pb10Sb11S28Mineralsulfide
- Oxammite(NH4)2(C2O4) · H2OMineral—
- Oxo-magnesio-hastingsiteNaCa2(Mg2Fe3+3)(Si6Al2)O22O2Mineralsilicate
- Oxo-mangani-leakeiteNaNa2(Mn3+4Li)Si8O22O2Mineralsilicate
- Oxy-chromium-draviteNaCr3(Cr4Mg2)(Si6O18)(BO3)3(OH)3OMineralsilicate
- Oxy-draviteNa(Al2Mg)(Al5Mg)(Si6O18)(BO3)3(OH)3OMineralsilicate
- Oxy-dravite-1ANa(Mg2Al)Al6(Si6O18)(BO3)3(OH)3OVariety—
- Oxy-foitite◻(Fe2+Al2)Al6(Si6O18)(BO3)3(OH)3OMineralsilicate
- Oxy-schorlNa(Fe2+2Al)Al6(Si6O18)(BO3)3(OH)3OMineralsilicate
- Oxy-vanadium-draviteNaV3(V4Mg2)(Si6O18)(BO3)3(OH)3OMineralsilicate
- Oxybismutomicrolite(Bi1.33◻0.67)Ta2O6OMineraloxide
- OxycalciomicroliteCa2Ta2O7Mineraloxide
- OxycalciopyrochloreCa2Nb2O6OMineraloxide
- OxycalcioroméiteCa2Sb5+2O7Mineraloxide
- OxykinoshitaliteBaMg2Ti4+O2(Si2Al2)O10Mineralsilicate
- Oxynatromicrolite(Na,Ca,U)2(Ta,Nb)2O6(O,F)Mineraloxide
- OxyphlogopiteK(Mg,Ti,Fe)3[(Si,Al)4O10](O,F)2Mineralsilicate
- OxyplumbopyrochlorePb2Nb2O6OMineraloxide
- OxyplumboroméitePb2Sb2O7Mineraloxide
- OxystannomicroliteSn2Ta2O6OMineraloxide
- Oxystibiomicrolite(Sb3+,Ca)2Ta2O6OMineraloxide
- OxyvaniteV3+2V4+O5Mineraloxide
- Oxyyttrobetafite-(Y)Y2Ti2O6OMineraloxide
- OyamaliteZr(SiO4)Variety—
- OyeliteCa5BSi4O13(OH)3 · 4H2OMineralsilicate
- OyoniteAg3Mn2Pb4Sb7As4S24Mineralsulfide
- OzernovskiteFe3+4(Te4+O4)(Te4+O3)4 · 7H2OMineraloxide
- OzerovaiteNa2KAl3(AsO4)4Mineralphosphate