All minerals, synonyms and varieties beginning with letter = O, ö, Ö.

O-dominant amphiboles	Onyx	Otavite
O'Danielite	Oosterboschite	Otjisumeite
Oberthürite	Opal	Ottemannite
Obertiite (Ob) amphiboles	Opal-AN	Ottensite
Oberwolfachite	Ophirite	Ottohahnite
Oboyerite	Oppenheimerite	Ottoite
Obradovicite group	Orangite	Ottoliniite
Obradovicite-KCu	Orcelite	Ottrélite
Obradovicite-NaCu	Ordoñezite	Otwayite
Obradovicite-NaNa	Oregonite	Oulankaite
Odigitriaite	Oreillyite	Ourayite
Odikhinchaite	Organovaite group	Oursinite
Odinite	Organovaite-Mn	Ovamboite
Odinite-1T	Organovaite-Zn	Overite
Odintsovite	Orickite	Owensite
Oenite	Orientite	Owyheeite
Örebroite	Orishchinite	Oxammite
OFF zeolite structure group	Orlandiite	Oxiberaunite
Offretite	Orlets	Oxide garnets (Z charge 6)
Oftedalite	Orlovite	Oxide garnets; Bitikleite group (Z charge 9)
Ogdensburgite	Orlymanite	Oxo-magnesio-ferri-hornblende
Ognitite	Ornithite	Oxo-magnesio-hastingsite
Ohmilite	Orpheite	Oxo-mangani-leakeite
Ojuelaite	Orpiment	Oxy-chromium-dravite
Okanoganite-(Y)	Orschallite	Oxy-dravite
Okayamalite	Orthoamphibole	Oxy-foitite
Okenite	Orthobrannerite	Oxy-schorl
Okhotskite	Orthobrochantite	Oxy-vanadium-dravite
Okieite	Orthochamosite	Oxybiotite
Okruschite	Orthochrysotile	Oxybismutomicrolite
Oldhamite	Orthoclase	Oxycalciobetafite
Olekminskite	Orthocuproplatinum	Oxycalciomicrolite
Olenite	Orthoericssonite	Oxycalciopyrochlore
Olgite	Orthojoaquinite-(Ce)	Oxycalcioroméite
Oligoclase	Orthojoaquinite-(La)	Oxykenomicrolite
Oligonite	Orthominasragrite	Oxykinoshitalite
Olivenite	Orthopinakiolite	Oxynatromicrolite
Olivine group	Orthopinakiolite group	Oxynatropyrochlore
Olkhonskite	Orthopyroxene group	Oxyphlogopite
Olmiite	Orthoserpierite	Oxyplumbobetafite
Olmsteadite	Orthowalpurgite	Oxyplumbopyrochlore
Olsacherite	Osakaite	Oxyplumboroméite
Olshanskyite	Osarizawaite	Oxyspinel group
Olympite	Osarsite	Oxystannomicrolite
Omariniite	Osbornite	Oxystibiomicrolite
Omeiite	Oscarkempffite	Oxyuranobetafite
Ominelite	Oskarssonit subgroup	Oxyvanite
Omongwaite	Oskarssonite	Oxyyttropyrochlore-(Y)
Omphacite	Osmiridium	Oyelite
Omsite	Osmium	Oyonite
Oncophyllite	Osumilite	Ozerovaite
Ondrušite	Osumilite Group	Ozocerite
Oneillite	Osumilite-(Mg)
Onoratoite	Oswaldpeetersite

All minerals by alphabet

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