Mineral Specimen Images (O)

Orthochamosite: (Fe++,Mg,Fe+++)5Al(Si3Al)O10(OH,O)8

Comments: Pale green micaceous orthochamosite in quartz.
Location: Near Manggruvan, Sweden. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Orthochrysotile: Mg3Si2O5(OH)4

Comments: Pale tan asbestos fiber (orthochrysotile) vein in rock.
Location: El Dorado Mine, Salt River Canyon, Gila County, Arizona, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Orthoclase: KAlSi3O8  
Lorenzenite: Na2Ti2Si2O9

Comments: Striated, dark violet crystal of lorenzenite in cream-colored orthoclase.
Location: Khibiny Massif, Kola Peninsula, Russia. Scale: 1.3 x 1.2 cm.
© John Veevaert

Orthoclase: KAlSi3O8

Comments: Carlsbad twinned crystal of orthoclase. Former Martín Oliete Fontela collection.
Location: Zarzalejo, Madrid. Scale: 5.2x4.6x2.2 cm.
© Fabre Minerals

Orthoclase: KAlSi3O8

Comments: Gemmy, twinned adularia (orthoclase) specimen on matrix. Former Bally Museum collection.
Location: Rhonegletscher, Switzerland. Scale: Crystal size 3 x 2 cm.
© Fabre Minerals

Orthoericssonite: BaMn2(Fe+++O)Si2O7(OH)  
Ericssonite: BaMn++2Fe+++O[Si2O7](OH)  
Tephroite: Mn2SiO4

Comments: Dark brown ericssonite, intergrown with orthoericssonite, with pink rhodonite, light brown diopside (var. schefferite) and gray tephroite.
Location: Langban, Varmland, Sweden. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Orthominasragrite: VO(SO4)·5(H2O)

Comments: Dark blue, spherical aggregate of orthominasragrite.
Location: Temple Mountain, Emery Co., Utah, USA. Scale: Picture size 1 mm.
© Thomas Witzke / Abraxas-Verlag

Orthoserpierite: Ca(Cu,Zn)4(SO4)2(OH)6·3(H2O)

Comments: Vivid blue green sheets and coatings of orthoserpierite on matrix.
Location: Galiuro Mt. Copper Creek, Pinal County, Arizona, USA. Scale: 3.0 X 4.4 cm.
© John Veevaert

Orthowalpurgite: (UO2)Bi4O4(AsO4)2·2(H2O)

Comments: Plastic container with fragments of the holotype specimen for orthowalpurgite.
Location: Schmiedestollen, Black Forest, near Wittichen, Baden-Württemberg, Germany. Scale: Not Given.
© German Type Specimen Catalogue

Osarizawaite: PbCuAl2(SO4)2(OH)6

Comments: Light blue micro crystals of osarizawaite and minor azurite filling vugs.
Location: Silver Hill Mine, near Marana, Pinal Co. Arizona, USA. Scale: 3 x 2 cm.
© John Veevaert

Osbornite: TiN

Comments: BSE image of osbornite (osb colored yellow) TiN; me = Fe(Ni)-metal; px = pyroxene; ol = olivine.
Location: Isheyevo carbonaceous chondrite (CB3b), Ishimbai region of Bashkortostan, Russia. Discovered 2003. Scale: See Image.
© Annual Meteoritical Society Meeting

Osmium: (Os,Ir)  
Cooperite: (Pt,Pd,Ni)S  
Vasilite: (Pd,Cu)16(S,Te)7  
Vysotskite: (Pd,Ni)S

Comments: BSE image taken with a SEM of the sulfide-dominant microparagenesis filling a gas vacuole. Cooperite crystal surrounded by Pd-Cu-Pt-S phase (vasilite?), vysotskite and osmium laths (white) in chalcopyrite-bornite matrix (dark). (CanMin 38:1258).
Location: Pustaya River placer deposit, situated within the Koryak-Kamchatka platinum-bearing belt of Alaskan-type intrusions in eastern Russia. Scale: See Image.
© Canadian Mineralogist

Osumilite-(Fe): (K,Na)(Fe++,Mg)2(Al,Fe+++)3(Si,Al)12O30

Comments: Dark blue crystals of osumilite-(Fe) in matrix.
Location: Cava Fontana, Monte Arci, Cagliari, Sardinia, Italy. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Osumilite-(Mg): (K,Na)(Mg,Fe++)2(Al,Fe+++)3(Si,Al)12O30

Comments: Sapphire-blue colored osumilite-(Mg) crystal in dacite.
Location: Yamanoguchi, Iriki, Satsuma-gun, Kagoshima Prefecture, Kyushu Island, Japan. Scale: Crystal Size 0.05 cm.
© Jeff Weissman / Photographic Guide to Mineral Species

Oswaldpeetersite: (UO2)2CO3(OH)2·4(H2O)

Comments: Yellow oswaldpeetersite in matrix.
Location: Jomac Mine, White Canyon,White Canyon District (White Canyon), San Juan Co., Utah, USA. Scale: Picture size 1.2 mm.
© Thomas Witzke / Abraxas-Verlag

Oswaldpeetersite: (UO2)2CO3(OH)2·4(H2O)

Comments: Greenish-yellow, acicular, radial-spherical blebs of oswaldpeetersite on matrix.
Location: Jomac Mine, San Juan County, Utah, USA. Scale: Picture size 5 mm.
© Paul M. Schumacher

Otavite: CdCO3

Comments: White rhombohedra of otavite.
Location: Tsumeb mine, Tsumeb, Otavi District, Oshikoto, Namibia. Scale: See Image.
© Rruff Database

Ottensite: Na3(Sb2O3)3(SbS3)·3H2O

Comments: Red-brown crusts of ottensite on stibnite.
Location: Qinglong (Dachang) Sb-Au deposit, Qinglong Co., Qianxi'nan Autonomous Prefecture, Guizhou Province, China. Scale: Specimen size 5.2 x 3.0 x 2.9 cm.
© Rob Lavinsky

Ottrelite: (Mn,Fe++,Mg)2Al4Si2O10(OH)4

Comments: Dark green crystalline ottrelite in quartz.
Location: Vielsalm, Luxembourg, Belgium. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Otwayite: Ni2(CO3)(OH)2·(H2O)

Comments: Pale green botryoidal otwayite on serpentinite rock.
Location: Otway Prospect, Nullagin Plain, Western Australia, Australia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species