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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