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Nasonite: Pb6Ca4Si6O21Cl2 Epidote-(Pb): (Ca,Pb,Sr)2(Al,Fe+++)3(SiO4)(Si2O7)O(OH)
Comments: Colorless, transparent hexagonal prism of nasonite on reddish brown hancockite (epidote-(Pb)). Location: Franklin, Sussex County, New Jersey, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Natanite: Fe++Sn++++(OH)6
Comments: Reddish brown crystal of natanite on matrix. Location: Potosi mine, Santa Eulalia, Chihuahua, Mexico. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Natrochalcite: NaCu2(SO4)2(OH)·(H2O)
Comments: Green, transparent crystals of natrochalcite on dark green atacamite. Location: Chuquicamata, Antofagasta, Chile. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Natrolite: Na2[Al2Si3O10]·2(H2O)
Comments: Transparent prismatic crystals of natrolite. Location: Usti (Aussig), Bohemia, Czech Republic. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Naumannite: Ag2Se
Comments: Black crystal of Naumannite in a quartz-lined vug. Location: DeLamar mine, DeLamar, Owyhee County, Idaho. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Nealite-(H2O): Pb4Fe++(As+++O3)2Cl4·2(H2O)
Comments: Orange crystals of nealite-(H2O) on matrix. Location: Laurium, Greece. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Nenadkevichite: (Na,Ca,K)(Nb,Ti)Si2O6(O,OH)·2(H2O)
Comments: Pinkish crystal of nenadkevichite on matrix. Location: Monte St. Hilaire, Quebec, Canada. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Nepheline: (Na,K)AlSiO4
Comments: Stubby, hexagonal prism of Nepheline in matrix. Location: Point of Rocks Mesa, Colfax County, New Mexico. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Nickeline: NiAs
Comments: Stubby, crude blocky crystals of nickeline. Location: Gowaganda, Ontario, Canada. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Nosean: Na8Al6Si6O24(SO4)
Comments: Stubby crystal of nosean on matrix. Location: Mendig, Laacher See, Rhineland-Pal., Germany. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Offretite: (K2,Ca,Mg)2.5Al5Si13O36·15(H2O)
Comments: Clear crystal of offretite on matrix. Location: Mont Simiouse, near Montbrison, Loire, France. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Okanoganite-(Y): (Na,Ca)3(Y,Ce)12Si6B2O27F14
Comments: Cream-colored twinned crystal of okanoganite-(Y) on matrix. Location: Washington Pass, Okanogan County, Washington, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Olivenite: Cu2AsO4(OH)
Comments: Dark green crystals of olivenite on matrix. Location: Majuba Hill mine, Pershing County, Nevada, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Olmsteadite: KFe++2(Nb,Ta)(PO4)2O2·2(H2O)
Comments: Dark brown crystals of olmsteadite with jahnsite on siderite. Location: Big Chief mine, Keystone, Penningtion County, South Dakota, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Ordonezite: ZnSb2O6
Comments: Greenish, glassy crystals of ordonezite. Location: Santin mine, Guanajuato, Mexico. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
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
Papagoite: CaCuAlSi2O6(OH)3
Comments: Electric blue crystals of papagoite in matrix. Location: New Cornelia mine, Ajo, Pima County, Arizona. USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Parabutlerite: Fe+++(SO4)(OH)·2(H2O)
Comments: Yellow to brownish yellow parabutlerite crystals. Location: Shagand Yazd, Iran. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Paradamite: Zn2(AsO4)(OH)
Comments: Yellow paradamite crystals on a gossanous matrix. Location: Ojuela mine, Mapimi, Druango, Mexico. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Parahopeite: Zn3(PO4)2·4(H2O)
Comments: Transparent, prismatic parahopeite crystals with keckite. Location: Hagendorf, Bavaria, Germany. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals