Click on thumbnails for a larger image. Please be patient since some of these pages of thumbnail images take some time to load. These mineral photos are copyrighted by their owners and may not be used without permission.
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.. © John Betts - Fine Minerals
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. © John Betts - Fine Minerals
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. © John Betts - Fine Minerals
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. © John Betts - Fine Minerals
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. © John Betts - Fine Minerals
Okenite: Ca3[Si6O15]·6(H2O)
Comments: Cotton-ball cluster of white okenite crystals. Location: Khandivali quarry, Maharashtra, India. Scale: 3x3x2 cm. © John Betts - Fine Minerals
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. © John Betts - Fine Minerals
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. © John Betts - Fine Minerals
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. © John Betts - Fine Minerals
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. © John Betts - Fine Minerals
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. © John Betts - Fine Minerals
Plagioclase: (Na,Ca)(Si,Al)4O8 Oligoclase: (Na,Ca)(Si,Al)4O8
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.. © John Betts - Fine Minerals
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. © John Betts - Fine Minerals
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. © John Betts - Fine Minerals
Pyrope: Mg3Al2(SiO4)3
Comments: Transparent, dark-red pyrope garnet. Location: Governador Valadares, Rio Doce, Minas Gerais, Southeast Region, Brazil. Scale: 6x6x6 mm. © John Betts - Fine Minerals
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. © John Betts - Fine Minerals
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. © John Betts - Fine Minerals
Ramsdellite: MnO2
Comments: Large mass of radiating ramsdellite crystals with terminated crystals. Location: Lake Valley District, Sierra Co., New Mexico, USA. Scale: 11x10x8 cm. © John Betts - Fine Minerals
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. © John Betts - Fine Minerals