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List of Minerals - O
O
Oligoclase
Olivine (a group of silicate minerals)
Olivenite
Omphacite
Ordonezite
Oregonite
Orpiment
Orthochrysotile
Orthoclase
Osarizawaite
Osmium
Osumilite
Otavite
Ottrelite
Overite
Varieties that are not valid species:
Onyx (a monochromatic banded variety of chalcedony)
Opal
Read more about this topic:
List Of Minerals