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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.
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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.
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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.
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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.
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Neptunite: KNa2Li(Fe++,Mn)2Ti2Si8O24  
Natrolite: Na2[Al2Si3O10]·2(H2O)

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.
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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.
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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.
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Olivine: (Mg,Fe)2SiO4  
Forsterite: Mg2SiO4

Comments: Peridot (Forsterite) recrystallized at the base.
Location: Skardu, Nooristan, Pakistan. Scale: 2.5 x 2.7 cm.
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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.
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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.
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Orthoclase: KAlSi3O8

Comments: Carlsbad twinned crystal of orthoclase. Former Martín Oliete Fontela collection.
Location: Zarzalejo, Madrid. Scale: 5.2x4.6x2.2 cm.
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Orthoclase: KAlSi3O8

Comments: Gemmy, twinned adularia (orthoclase) specimen on matrix. Former Bally Museum collection.
Location: Rhonegletscher, Switzerland. Scale: Crystal size 3 x 2 cm.
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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.
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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.
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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.
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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.
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Platinum: Pt

Comments: Crystallized platinum nugget.
Location: Russia. Scale: 0.5 x 0.7 cm.
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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.
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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.
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Prehnite: Ca2Al2Si3O10(OH)2

Comments: Very lustrous and brilliant prehnite.
Location: Deep Sahara, Morocco: Djbel Melh, Bou-Arfa. Scale: 9 x 6.5 cm.
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