
OFFRETITE – Beech Creek, Grant
County, Oregon
OFFRETITE - Herbstein, Vogelsberg, Hessen,
Germany
OFFRETITE – Spray, Wheeler County, Oregon
OJUELAITE – Mina Ojuela, Mapimi, Durango, Mexico T
OLGITE – Mt. Karnasurt, Lovozero Massif, Kola Peninsula, Russia D, T
OLIVINE - Dreisler Weiher Daun, Eifel District, Rhineland, Germany – See
FORSTERITE
OLIVINE – La Cuerva Volcano, Le Geria, Tias, Lanzarotte, Canary Islands – See
FORSTERITE
OLIVINE – Ray Pic, Central France – See FORSTERITE
OLIVINE - Sigurdfjelet Volcano, Svalbard, Spitzbergen Island, off the coast of
Norway – See FORSTERITE
OLMSTEADITE – Big Chief Pegmatite, Glendale, Pennington County, South Dakota D,
T
OMPHACITE – Glaucophane Ridge, 5 Miles No. of Llanada, Southern San Benito
County, California
ONORATOITE – Le Cetine Mine, Grosseto, Italy
OPAL Var. Geyserite – Lower Geyser Basin, Yellowstone Park, Wyoming
OPAL Var. Hydrophane - Square Top Mountain, near Dalby, Southeast Queensland,
Australia
ORDONEZITE - 27 Km. SW of Agua Prieta, La Morita, Sonora,
Mexico
ORIENTITE - Manganese Exploration Mine, Copper Harbor,
Michigan
ORPIMENT – Allchar, Macedonia (formerly Yugoslavia) D
ORTHOJOAQUINITE-(Ce) – Dallas Gem Mine, Southern San Benito County, California
D, T
OSARIZAWAITE - Cordillera Mine, New South Wales,
Australia
OSARIZAWAITE - Omega Mine, Pima County,
Arizona
OSARIZAWAITE - Osarizawa Mine, Kazumo Shi, Akita Prefecture, Japan
T
OSARIZAWAITE - Silver Hill Mine, Pima County,
Arizona
OSARIZAWAITE - Teutonic Bore, near Agnew Ni Deposit, W.A.,
Australia
OSUMILITE - Funtanafigu Quarry, Monte Arci, near Oristano, Sardinia,
Italy
OSUMILITE – Obsidian Cliffs, Lane County, Oregon
OSUMILITE - Sakkabira, Kagosima Prefecture, Kyushu,
Japan
OTWAYITE - Otway Prospect, Nullagine Plains, W.A., Australia
OWYHEEITE - Banner Mine, Boise County, Idaho
D
OWYHEEITE - Broken Hills Mining District, Mineral County, Nevada
OWYHEEITE - Morey Mine, Nye County, Nevada
OXYKERCHENITE - Kerch Peninsula, Crimea Oblast, Ukraine - See VIVIANITE
OYELITE - N'Chwaning II Mine, Kalahari Manganese Field, N. Cape Prov., Rep. S.
Africa
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