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Obsidian
 Ochre
 Octahedrite Odontolite Oellacherite
Offretite Oisanite Okenite Okkolite Oldhamite
Oligoclase Oligon Spar Oligonite Olivenite Olivine group
Olsacherite Olshanskyite Omphacite Onyx Onyx Marble
Opal Opal Agate Opal Jasper Orangite Oriental Amethyst
Oriental Emerald Oriental Topaz Orientite Orpiment Orthite
Orthobrannerite Orthoclase Orthowalpurgite Osarizawaite Osmiridium
Osmium Osteolite Oswaldpeetersite Ottrélite Oursinite
Overite Owyheeite Oxammite Oxyhornblende Ozarkite
Ozocerite Ozokurite



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