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Monteregianite-(Y): (Na,K)6(Y,Ca)2Si16O38·10(H2O)

Comments: Feathery, radiating pinkish-white acicular monteregianite crystals on one end of greenish matrix.
Location: Desourdy Quarry, Mont Saint-Hilaire, Quebec, Canada. Scale: Specimen Size 5x2.5x2.5 cm..
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Mordenite: (Ca,Na2,K2)Al2Si10O24·7(H2O)  
Heulandite-Ca: (Ca,Na)2-3Al3(Al,Si)2Si13O36·12(H2O)

Comments: Pink heulandite crystals up to 15 mm in fibrous white mordenite matrix.
Location: Rats Nest Claim, Challis, Custer Co., Idaho, USA. Scale: 6x6x4 cm.
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Murdochite: PbCu6O8-x(Cl,Br)2x  
Smithsonite: ZnCO3

Comments: Dark metallic micro crystals of murdochite on pale blue-gray smithsonite crystal covered matrix.
Location: Silver Hill Mine group, Silver Hill, Waterman District, Waterman Mts, Pima Co., Arizona, USA. Scale: 5x4x2 cm.
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Muscovite: KAl2(Si3Al)O10(OH,F)2

Comments: Seams of green muscovite var. fuchsite in quartz matrix with minor pyrite crystals.
Location: Wolfe's Neck locality, Freeport, Cumberland Co., Maine, USA. Scale: 7x5x4 cm.
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Nickelboussingaultite: (NH4)2(Ni,Mg)(SO4)2·6(H2O)

Comments: Fragment of sulfide (pyrite) matrix with microcoating of nickelboussingaultite in a gelatin capsule.
Location: Noril'sk, Putoran Plateau, Taimyr Peninsula, Siberia, Russia. Scale: Capsule Size 20 mm.
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Okenite: Ca3[Si6O15]·6(H2O)

Comments: Cotton-ball cluster of white okenite crystals.
Location: Khandivali quarry, Maharashtra, India. Scale: 3x3x2 cm.
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Oligoclase: (Na,Ca)(Si,Al)4O8  
Plagioclase: (Na,Ca)(Si,Al)4O8

Comments: Rectangular cleavage fragment of salmon-orange oligoclase (sunstone) feldspar.
Location: Norway. Scale: 47x30x7 mm.
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Opal: SiO2·n(H2O)

Comments: Section of fossilized tree limb that is now completely replaced by black opal.
Location: Virgin Valley District, Humboldt Co., Nevada, USA. Scale: 20x13x11 mm.
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Panunzite: (K,Na)AlSiO4

Comments: Translucent colorless panunzite crystals lining a small cavity in greenish volcanic matrix.
Location: Valle de Diablo, Somma-Vesuvius Complex, Campania, Italy (Type Locality for Panunzite). Scale: Crystal Size 1-1.5 mm.
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Pentlandite: (Fe,Ni)9S8

Comments: Ore sample of a mixture of several sulfide minerals: pentlandite, chalcopyrite, and pyrrhotite.
Location: Frood-Stobie Mine, Sudbury District, Ontario, Canada. Scale: 20x15x7 mm.
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Petalite: LiAlSi4O10

Comments: Translucent, gemmy , equant petalite crystal with an etched surface texture resulting in irregular faces.
Location: Paprok, Konar (Kunar; Konarh; Konarha; Nuristan) Province, Afghanistan. Scale: 5x3.5x3 cm.
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Plagioclase: (Na,Ca)(Si,Al)4O8  
Oligoclase: (Na,Ca)(Si,Al)4O8

Comments: Rectangular cleavage fragment of salmon-orange oligoclase (sunstone) feldspar.
Location: Norway. Scale: 47x30x7 mm.
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Plattnerite: PbO2

Comments: Rhombic calcite crystals with overgrowth of sparkling black plattnerite crystals.
Location: Ojuela mine, Mapimí, Mun. de Mapimí, Durango, Mexico. Scale: 5x3x2 cm..
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Plumbomicrolite: (Pb,Ca,U)2Ta2O6(OH)

Comments: Gray, octahedral crystal of plumbomicrolite.
Location: Ploskaya Mt, Keivy Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: 20x17x13 mm.
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Pumpellyite-(Fe++): Ca2Fe++(Al,Fe+++)2(SiO4)(Si2O7)(OH)2·(H2O)

Comments: Gas cavities in basalt matrix lined with sprays of 1 mm green pumpellyite-(Fe) crystals.
Location: Braen's Quarry, Haledon, Passaic Co., New Jersey, USA. Scale: 25x15x15 mm.
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Pyrope: Mg3Al2(SiO4)3

Comments: Transparent, dark-red pyrope garnet.
Location: Governador Valadares, Rio Doce, Minas Gerais, Southeast Region, Brazil. Scale: 6x6x6 mm.
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Quartz: SiO2  
Epistilbite: CaAl2Si6O16·5(H2O)

Comments: White epistilbite cluster 25 mm across on amethyst quartz crystal matrix.
Location: Sawda, Jalgaon, Maharashtra, India. Scale: 10x8x5 cm.
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Raite: Na4Mn++4Si8(O,OH)24·9(H2O)

Comments: Golden raite crystals up to 2 mm long filling cavities in white microcline with minor lomonosovite and natrolite.
Location: Lovozero Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: 7x4x3 cm.
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Ramsdellite: MnO2

Comments: Large mass of radiating ramsdellite crystals with terminated crystals.
Location: Lake Valley District, Sierra Co., New Mexico, USA. Scale: 11x10x8 cm.
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Rectorite: (Na,Ca)Al4(Si,Al)8O20(OH)4·2(H2O)

Comments: Blue Mountain District, Marble Township, Garland Co., Arkansas, USA.
Location: Five pieces of leather-like fragments of rectorite in twisted, irregular shapes. Scale: Specimen size 1-4 cm.
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