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Orcelite: Ni5-xAs2 (x=0.23)
Comments: Bronze micro spherical orcelite coated with greenish zaratite. Location: Tiebaghi Massif, New Caledonia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Ordonezite: ZnSb2O6
Comments: Greenish, glassy crystals of ordonezite. Location: Santin mine, Guanajuato, Mexico. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Oregonite: Ni2FeAs2
Comments: Steel gray, altering to brown, rounded oregonite pebble with serpentinite rock. Location: Josephine Creek, Josephine County, Oregon, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Organovaite-Mn: K2Mn(Nb,Ti)4(Si4O12)2(O,OH)4·6(H2O)
Comments: Crude pink organovaite-Mn pseudomorphs after vuonnemite. Location: Mt. Karnasurt, Lovozero, Kola Peninsula, Russia. Scale: Specimen Size 1.5x2.5 cm. © Diederik Visser
Organovaite-Zn: K2Zn(Nb,Ti)4(Si4O12)2(O,OH)4·6(H2O)
Comments: Crude pinkish-brown organovaite-Zn crystals in matrix. Location: Mt. Karnasurt, Lovozero, Kola Peninsula, Russia. Scale: Specimen Size 1x2.5 cm. © Diederik Visser
Orickite: CuFeS2·(H2O)
Comments: Black and white image of a polished section showing intergrown crystals of orickite in sodalite (dark). (AmMin 68:246). Location: Mafic alkalic diatreme at Coyote Peak near Orick, Humboldt County, California, USA. Scale: Image size 0.44 mm. © American Mineralogist
Orientite: Ca2Mn++Mn+++2Si3O10(OH)4
Comments: Reddish brown massive orientite with pyrolusite. Location: Oriente Province, Cuba. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Orlandiite: Pb3(Cl,OH)4(SeO3)·(H2O)
Comments: White, acicular crystals of orlandiite. Location: Baccu Locci Mine, Villaputzu, Cagliari Province, Sardinia, Italy. Scale: Picture size 2 mm. © Thomas Witzke / Abraxas-Verlag
Orlymanite: Ca4Mn++3Si8O20(OH)6·2(H2O)
Comments: Brown crystalline orlymanite with radiating structure, on inesite. Location: N'Chwaning Mine, Kuruman, Northern Cape Province, South Africa. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Orpheite: PbAl3(PO4,SO4)2(OH)6 (?)
Comments: Opaque botryoidal orpheite crust. Location: Near Valmy, Humboldt County, Nevada, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species