Mineral Specimen Images (O)

Oulankaite: (Pd,Pt)5(Cu,Fe)4SnTe2S2  
Telargpalite: (Pd,Ag)3Te  
Tulameenite: Pt2FeCu  
Chalcopyrite: CuFeS2

Comments: Gray long-prismatic crystal of oulankaite with light grayish telargpalite and pale yellowish-white rims of tulameenite in massive yellowish chalcopyrite. Polished section (from microprobe analysis) in reflected light.
Location: Lukkulaisvaara ultrabasic Massif, Olanga (Oulanka) River, Oulanka plutonic complex, Karelia Republic, Northern Region, Russia. Scale: Picture size 0.12 mm.
© Thomas Witzke / Abraxas-Verlag

Oursinite: (Co,Mg)(H3O)2[(UO2)SiO4]2·3(H2O)

Comments: Yellow velvety acicular sprays of oursinite crystals on matrix.
Location: Shinkolobwe Mine (Kasolo Mine), Shinkolobwe, Central area, Katanga Copper Crescent, Katanga (Shaba), Democratic Republic of Congo (Zaire). Scale: Picture Size 8 x 6 mm.
© Sandro Maggia/Minernet.it

Ovamboite: Cu20(Fe,Cu,Zn)6W2Ge6S32

Comments: BSE image of ovamboite (ov), germanite (germ) and chalcocite (cc).
Location: Tsumeb deposit, Namibia. Scale: See Image.
© Diederik Visser

Overite: CaMgAl(PO4)2(OH)·4(H2O)

Comments: Clear, pale yellow prismatic crystals of overite deep inside a crandallite vug.
Location: Clay Canyon, Fairfield, Oquirrh Mts, Utah Co., Utah, USA. Scale: Picture Size 2.5 mm.
© Jeff Weissman / Photographic Guide to Mineral Species

Owyheeite: Pb7Ag2(Sb,Bi)8S20

Comments: Acicular owyheeite microcrystals in quartz.
Location: Lower Magnolia Mine, Morey District, Nye County, Nevada, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Oxammite: (NH4)2(C2O4)·(H2O)

Comments: Pale yellow translucent crystalline granular oxammite.
Location: Petrogale Cave, Western Australia, Australia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Oxiberaunite: (Fe+++,Mn+++)Fe+++5(PO4)4O(OH)4·6(H2O)

Comments: Red-brown ball of radiating acicular oxiberaunite (eleonorite) microcrystals, on pegmatitic matrix.
Location: LCA Mine, Bessemer City, Gaston County, North Carolina, USA. Scale: Box size 3.18 cm x 3.18 cm.
© Richard Dale / Dale Minerals

Oxykinoshitalite: (Ba,K)(Mg,Fe++,Ti)3(Si,Al)4O10O2

Comments: Back-scattered-electron image of oxykinoshitalite, showing the prominent (001) cleavage, (CanMin, v43:1501).
Location: Fernando de Noronha Island, Pernambuco, Brazi. Scale: See Image.
© Canadian Mineralogist

Oyelite: Ca10B2Si8O29·12(H2O)  
Bultfonteinite: Ca2SiO2(OH,F)4

Comments: White encrustation of oyelite covering brownish botryoidal bultfonteinite.
Location: N'Chwaning Mine, Kalahari Manganese Field, Northern Cape Province, South Africa. Scale: 2 x 4 cm.
© John Veevaert

Oyelite: Ca10B2Si8O29·12(H2O)

Comments: Tufts of white acicular millimetric oyelite crystals on matrix.
Location: N'Chwaning Mine, Kalahari Manganese Field, Northern Cape Province, South Africa. Scale: Picture size 2 cm.
© Sandro Maggia/Minernet.it