List of minerals

obsidian
offrétite
okenite
olivenite
olivine
olmiite
opal
opal (var. fire)
opal (var. hyalite)
opal (var. Ni-opal)
opal (var. opalised wood)
opal (var. precious)
opal (var. wood opal)
orpiment
orthoclase
orthoclase (var. adularia)
oxykaersutite

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