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O'Danielite
Obradovicite group
Obsidian
Ochre
Octahedrite
Odontolite
Oellacherite
Offretite
Ogdensburgite
Oisanite
Ojuelaite
Okenite
Okkolite
Oldhamite
Olekminskite
Olgite
Oligoclase
Oligon Spar
Oligonite
Olivenite
Olivine group
Olmiite
Olmsteadite
Olsacherite
Olshanskyite
Omphacite
Onoratoite
Onyx
Onyx Marble
Opal
Opal Agate
Opal Jasper
Orangite
Oriental Amethyst
Oriental Emerald
Oriental Topaz
Orientite
Orpiment
Orschallite
Orthite
Orthobrannerite
Orthoclase
Orthominasragrite
Orthoserperite
Orthoserpierite
Orthowalpurgite
Osarizawaite
Osmiridium
Osmium
Osteolite
Osumilite
Oswaldpeetersite
Otavite
Ottrélite
Ottemannite
Otwayite
Oursinite
Overite
Owyheeite
Oxammite
Oxyhornblende
Oyelite
Ozarkite
Ozocerite
Ozokerite
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