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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
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