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Marcasite: FeS2
Comments: Metallic, brassy-colored marcasite with minor translucent quartz and white dolomite. Location: Panasqueira (3rd level), in the region of Beira Baixa, Portugal. Scale: 8 x 5.5 cm. © Fabre Minerals
Microcline: KAlSi3O8 Columbite-(Fe): Fe++Nb2O6
Comments: Blocky, dark brown ferrocolumbite on pale greenish blue amazonite (microcline). Location: Crystal Park, El Paso Co., Colorado, USA. Scale: 2.5 x 1.5 cm. © Fabre Minerals
Natrolite: Na2[Al2Si3O10]·2(H2O) Neptunite: KNa2Li(Fe++,Mn)2Ti2Si8O24
Comments: Jet-black square prisms of neptunite etched out of the enclosing white natrolite with minor benitoite. Location: Benitoite Gem Mine. San Benito Co. California, USA. Scale: 6.5 x 6 cm. © Fabre Minerals
Natrolite: Na2[Al2Si3O10]·2(H2O) Serandite: Na(Mn++,Ca)2Si3O8(OH) Analcime: NaAlSi2O6·(H2O)
Comments: Orange-red, blocky serandite with white, blocky natrolite and white, equant grains of analcime. Location: Mt. St. Hilaire, Canada. Scale: 4 x 3 cm. © Fabre Minerals
Neptunite: KNa2Li(Fe++,Mn)2Ti2Si8O24 Natrolite: Na2[Al2Si3O10]·2(H2O)
Nevskite: Bi(Se,S) Ingodite: Bi(S,Te) Telluronevskite: Bi3TeSe2
Comments: Intergrown metallic grains of ingodite, telluronevskite, and nevskiite. Location: Poruba pod Vihorlatom, Vihorlat Mountains, Kosice Slovak Republic. Scale: Specimen Size 2.8 × 1.7 × 1 cm. © Fabre Minerals
Norbergite: Mg3(SiO4)(F,OH)2
Comments: Yellow orange norbergite inclustions in white marble (calcite).. Location: Oakssaung Hill, Mogok, Mandalay Myanmar. Scale: Crystal size 5 mm. © Fabre Minerals
Olivine: (Mg,Fe)2SiO4 Forsterite: Mg2SiO4
Comments: Peridot (Forsterite) recrystallized at the base. Location: Skardu, Nooristan, Pakistan. Scale: 2.5 x 2.7 cm. © Fabre Minerals
Olmiite: CaMn[SiO3(OH)](OH)
Comments: Spherical aggregate of prismatic crystals of pinkish tan olmiite.. Location: N'chwaning II Mine, section 5 south stope, 46-47 roof, Kuruman South Africa. Scale: Specimen size 2.5 × 2 × 1.4 cm. © Fabre Minerals
Orpiment: As2S3
Comments: Deep orange-colored orpiment crystal aggregate. Location: Twin Creeks mine, 62 bench, north of Winnemucca, Humboldt County, Nevada. USA. Scale: 6.5 x 5.5 cm. © Fabre Minerals
Orthoclase: KAlSi3O8
Comments: Carlsbad twinned crystal of orthoclase. Former Martín Oliete Fontela collection. Location: Zarzalejo, Madrid. Scale: 5.2x4.6x2.2 cm. © Fabre Minerals
Comments: Gemmy, twinned adularia (orthoclase) specimen on matrix. Former Bally Museum collection. Location: Rhonegletscher, Switzerland. Scale: Crystal size 3 x 2 cm. © Fabre Minerals
Pargasite: NaCa2(Mg,Fe++)4Al(Si6Al2)O22(OH)2 Edenite: NaCa2Mg5Si7AlO22(OH)2
Comments: Blocky, dark green crystals of visually indistinguishable pargasite and edenite. Location: Kolonne bei, Embilipitiya, Sri Lanka. Scale: 4.5 x 1.7 x 3.7 cm. © Fabre Minerals
Perovskite: CaTiO3 Clinochlore: (Mg,Fe++)5Al(Si3Al)O10(OH)8
Comments: Square, opaque perovskite on green clinochlore. Very brilliant and with large crystals (2 x 1.5 cm.). Location: Ilmen Mountains. Chelyabinsk, Urals, Russia. Scale: 6 x 4.5 cm. © Fabre Minerals
Pezzottaite: Cs(Be2Li)Al2Si6O18
Comments: Hot-pink, hexagonal, floater crystal of pezzottaite. Location: Ambatovita, Mandrosonoro, Antsirabe, Madagascar. Scale: Crystal size 1.6x1.2x0.6 cm. © Fabre Minerals
Phlogopite: KMg3(Si3Al)O10(F,OH)2
Comments: Exceptionally well-crystallized wine-colored pseudo-hexagonal crystal of phlogopite on white calcite. Location: Kalu Khan, Badakhshan, Afghanistan. Scale: 6 x 5.5 cm. © Fabre Minerals
Platinum: Pt
Comments: Crystallized platinum nugget. Location: Russia. Scale: 0.5 x 0.7 cm. © Fabre Minerals
Poldervaartite: (Ca,Mn++)2SiO3(OH)2
Comments: Moderate reddish tint to yellowish poldervaartite crystalline druze on matrix. Location: N'chwaning II mine, section 5 south, stope 46-47 roof, Kuruman, Kalahari desert, South Africa. Scale: 6 x 3.5 x 4 cm. © Fabre Minerals
Pollucite: (Cs,Na)2Al2Si4O12·(H2O)
Comments: Isometric crystal of pollucite with clear quartz and sucrosic albite matrix. Location: Shigar mine, Dossu, Skardu, Pakistan. Scale: 14.6x10x11.5 cm. © Fabre Minerals
Prehnite: Ca2Al2Si3O10(OH)2
Comments: Very lustrous and brilliant prehnite. Location: Deep Sahara, Morocco: Djbel Melh, Bou-Arfa. Scale: 9 x 6.5 cm. © Fabre Minerals