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Nobleite: CaB6O9(OH)2·3(H2O)
Comments: Platy nobleite microcrystals on colemanite. Location: Corkscrew Mine, Corkscrew Canyon, Death Valley, Inyo County, California, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Nolanite: (V+++,Fe++,Fe+++,Ti)10O14(OH)2
Comments: Dark gray to black massive nolanite. Location: Fishhook Bay, Saskatchewan, Canada. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Nontronite: Na0.3Fe+++2(Si,Al)4O10(OH)2·n(H2O)
Comments: Green massive nontronite in quartz. Location: Horni Slavkov, Zapadocesky, Czech Republic. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Normandite: NaCa(Mn++,Fe++)(Ti,Nb,Zr)Si2O7(O,F)2
Comments: Divergent acicular normandite crystals in pegmatite. Location: Mount Partomchorr, Khibiny Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Novacekite: Mg(UO2)2(AsO4)2·12(H2O) Metanovacekite: Mg(UO2)2(AsO4)2·4-8(H2O)
Comments: Yellow, translucent platy novacekite/metanovacekite crystal aggregate. Location: Rabejac Mine, Olmet, Herault, France. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Novakite: (Cu,Ag)21As10 Berzelianite: Cu2Se
Comments: Gray metallic dendritic novakite in white calcite with tarnished black berzelianite. Location: Cerny Dul, Bohemia, Vychodocesky, Czech Republic. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Nsutite: (Mn++++1-x)(Mn++x)(O2-2x)(OH2x) where x = 0.06-0.07
Comments: Dark gray to black sub-metallic to dull massive nsutite. Location: Nsuta, Western Province, Ghana. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Obradovicite: H4(K,Na)Cu++Fe+++2(AsO4)(MoO4)5·12(H2O)
Comments: Brownish yellow obradovicite coatings on quartz. Location: Chuquicamata, Antofagasta, Chile. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Ohmilite: Sr3(Ti,Fe+++)(Si2O6)2(O,OH)·2-3(H2O)
Comments: Pale yellow translucent acicular ohmilite crystal cluster in matrix. Location: Hashidate, Ohmi cho, Niigata, Japan. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Ojuelaite: ZnFe+++2(AsO4)2(OH)2·4(H2O)
Comments: Yellow-green ojuelaite masses on limonite and quartz. Location: Mina Ojuela, Mapimi, Durango, Mexico. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Oldhamite: (Ca,Mg,Fe)S
Comments: Brown crystalline oldhamite grains in anhydrite. Location: Ronneburg, Thuringen, Germany. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Oligoclase: (Na,Ca)(Si,Al)4O8 Plagioclase: (Na,Ca)(Si,Al)4O8
Comments: Clear glassy crystalline oligoclase with milky quartz and muscovite. Location: Bakersville, Mitchell County, North Carolina, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Olivenite: Cu2AsO4(OH) Arsenogoyazite: (Sr,Ca,Ba)Al3(AsO4,PO4)2(OH,F)5·(H2O)
Comments: White micro-botryoids of arsenogoyazite with light green acicular crystal sprays of olivenite and dark green malachite on brown limonite. Location: Centennial Eureka Mine, Juab County, Utah. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Omphacite: (Ca,Na)(Mg,Fe++,Al)Si2O6
Comments: Dark green crystalline omphacite with glaucophane. Location: Healdsburg, Sonoma County, California, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Opal: SiO2·n(H2O) Todorokite: (Na,Ca,K)2(Mn++++,Mn+++)6O12·3-4.5(H2O)
Comments: Dendritic todorokite in white opal. Location: Brosso Mine, Ivrea, Torino, Piemonte, Italy. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
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
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
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
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