Nabaphite

Comments: Translucent tetrahedral nabaphite microcrystal.
Location: Mount Kukisvumchorr, Khibiny Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Nabesite

Comments: White, tabular crystals of nabesite.
Location: Kvanefjeld plateau, Il?maussaq massif, Greenland. Scale: Picture size 1.7 mm.
© Thomas Witzke / Abraxas-Verlag

Nacaphite   Thermonatrite

Comments: Sparse pale yellow-brown microcrystal and crystalline nacaphite with white thermonatrite on a dark matrix.
Location: Khibiny Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Nacareniobsite-(Ce)

Comments: White to light brownish nacareniobsite-(Ce) in an igneous rock matrix.
Location: Kvanefjeld Tunnel, Il?maussaq massif, Greenland. Scale: Picture size 4 mm.
© Thomas Witzke / Abraxas-Verlag

Nacrite

Comments: Colorless, transparent crystal of macrite on matrix.
Location: Hunersedge mine, Baden-Wurttemburg, Germany. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Nadorite

Comments: Blocky, yellowish brown crystals of nadorite on matrix.
Location: Langban mine, Filipstad , V?rmland, Sweden. Scale: Crystal size 1 mm.
© Tom Loomis / Dakota Matrix

Nafertisite

Comments: Dark green fibrous nafertisite masses in pegmatite rock.
Location: Mount Kukisvumchorr, Khibiny Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Nagyagite

Comments: Nagyagite partially covered with calcite.
Location: Sacaramb (Nagyag), Romania. Scale: Crystal size 1 cm.
© John Veevaert

Nahcolite

Comments: Massive, translucent nahcolite.
Location: Anvil Point, Rifle, Garfield County, Colorado, USA. Scale: 2.1 x 1.4 cm.
© John Veevaert

Nahcolite   Trona

Comments: Massive, coarse-grained Trona from a drill core of the upper mixed-layer Saltbed. White areas are nahcolite alteration.
Location: Searles Lake, San Bernardino County, California, USA. Scale: 12 x 15 cm.
© Dave Barthelmy

Nahpoite

Comments: Nearly opaque white powdery nahpoite.
Location: Big Fish River, Yukon Territory, Canada. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Nakauriite

Comments: Blue crystals of nakauriite on green serpentinite.
Location: Lobming, Styria, Austria. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Namansilite

Comments: Dark red namansilite veinlets in rock (slabbed specimen).
Location: Woods mine, near Tamworth, New South Wales, Australia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Nambulite

Comments: Brown crystalline nambulite with pinkish rhodonite.
Location: Gozaisho Mine, Iwaki, Fukushima, Japan. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Namibite

Comments: Dark green crystals of namibite on matrix.
Location: Pucher Shaft, Schneeberg District, Erzgebirge, Saxony, Germany. Scale: Picture size 1.3 mm.
© Thomas Witzke / Abraxas-Verlag

Namuwite

Comments: Sky-blue, platy crystals of namuwite on matrix.
Location: Gelbe Birke Mine, Schwarzenberg District, Erzgebirge, Saxony, Germany. Scale: Picture size 1.5 mm.
© Thomas Witzke / Abraxas-Verlag

Narsarsukite

Comments: Narsarsukite crystal in matrix.
Location: Mont Saint-Hilaire, Quebec, Canada. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Nasonite   Hancockite

Comments: Colorless, transparent hexagonal prism of Nasonite on reddish brown hancockite.
Location: Franklin, Sussex County, New Jersey, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Nastrophite

Comments: Glassy to chalky crystalline nastrophite fragment.
Location: Lovozero Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Natanite

Comments: Reddish brown crystal of natanite on matrix.
Location: Potosi mine, Santa Eulalia, Chihuahua, Mexico. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Natrite

Comments: White opaque massive natrite.
Location: Lovozero Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Natroalunite

Comments: Pure white porcelaneous massive natroalunite.
Location: Sugarloaf Butte, Quartzite, La Paz County, Arizona, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Natroapophyllite

Comments: Pale pink opaque blocky crystal natroapophyllite aggregate.
Location: Boghil Quarry, Glengormley, Newtownabbey, County Antrim, Northern Ireland. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Natrochalcite   Krohnkite

Comments: Royal blue kr?hnkite and green natrochalcite.
Location: Chiquicamata, Chile. Scale: 3.5 x 2 cm.
© John Veevaert

Natrochalcite

Comments: Green, transparent crystals of natrochalcite on dark green atacamite.
Location: Chuquicamata, Antofagasta, Chile. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Natrodufrenite

Comments: Greenish gray, botryoidal aggregates natrodufrenite on hematite-stained quartz.
Location: Greifenstein Rocks, Ehrenfriedersdorf, Erzgebirge, Saxony, Germany. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Natrojarosite

Comments: Yellow brown natrojarosite crystals.
Location: Kamareza Mine, Laurium, Attiki, Greece. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Natrolemoynite

Comments: Radiating spray of tan natrolemoynite crystals, with brown coating, with white albite.
Location: Mont Saint Hilaire, Quebec, Canada. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Natrolite   Eudialyte

Comments: Druse of gemmy, red eudialyte crystals to 1 mm on white natrolite.
Location: Mt. St. Hilaire, Quebec, Canada. Scale: Picture size 1.5 cm.
© John Veevaert

Natrolite

Comments: Transparent prismatic crystals of natrolite.
Location: Usti (Aussig), Bohemia, Czech Republic. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Natrolite   Neptunite

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   Serandite   Analcime

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

Natromontebrasite

Comments: Pale tan to orange natromontebrasite cleavages in quartz.
Location: Mica Load, Canon City, Fremont County, Colorado, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Natron

Comments: Opaque white powdery massive natron.
Location: Atlin, British Columbia, Canada. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Natroniobite

Comments: Olive-green colored translucent crystalline natroniobite fragments.
Location: Lesnaya Varaka Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Natrosilite

Comments: Colorless, clear to translucent crystalline natrosilite fragment, found in pale pink ussingite.
Location: Lovozero Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Natroxalate

Comments: Colorless transparent crystalline natroxalate fragment.
Location: Mount Kukisvumchorr, Khibiny Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Naujakasite   Villiaumite

Comments: Greenish-gray crystals of naujakasite with red villiaumite.
Location: Narsaq river, Kvanefjeld Mt., Il?maussaq massif, Greenland. Scale: Picture size 4 mm.
© Thomas Witzke / Abraxas-Verlag

Naumannite

Comments: Black crystal of Naumannite in a quartz-lined vug.
Location: DeLamar mine, DeLamar, Owyhee County, Idaho. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Navajoite

Comments: Purple-brown adamantine navajoite coatings on conglomerate.
Location: Monument #2 Mine, Monument Valley, Apache County, Arizona, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Nealite

Comments: Orange-yellow prismatic crystals of Nealite on matrix.
Location: Lavrion District slag localities, Attik? (Attica; Attika) Prefecture, Greece. Scale: Picture size 2 mm.
© Thomas Witzke / Abraxas-Verlag

Nealite-(H2O)

Comments: Orange crystals of nealite-(H2O) on matrix.
Location: Laurium, Greece. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Nekoite

Comments: Sprays of translucent acicular nekoite crystals.
Location: Iron Cap Mine, Graham County, Arizona, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Neltnerite

Comments: Black neltnerite microcrystals lining vugs.
Location: Manganese Creek, Keeweenaw County, Michigan, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Nenadkevichite

Comments: Pinkish crystal of nenadkevichite on matrix.
Location: Monte St. Hilaire, Quebec, Canada. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Neotocite

Comments: Dark brown resinous massive neotocite.
Location: Buzzarla Mine, San Luis Obispo County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Nepheline

Comments: Stubby, hexagonal prism of Nepheline in matrix.
Location: Point of Rocks Mesa, Colfax County, New Mexico. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Nepouite

Comments: Massive, green n?pouite.
Location: Callenberg North (no. 2) open cut, Callenberg, Glauchau, Saxony, Germany. Scale: Specimen size 4 cm.
© Thomas Witzke / Abraxas-Verlag

Neptunite   Natrolite

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

Nesquehonite

Comments: Scanning electron micrographs of nesquehonite clusters showing the typical elongated habit. (AmMin, 88:1882).
Location: Crystals associated with the remains of a saguaro, Carnegiea gigantea from south and west central Arizona. Scale: Scale Bar 50 µ-m (lower left).
© American Mineralogist

Neustadtelite

Comments: Scanning electron microscope micrograph of neust?dtelite. (AmMin 87:728).
Location: Mine dumps of the G?ldener Falk mine near Schneeberg-Neust?dtel, Saxony, Germany. Scale: Scale Bar 15 µm.
© American Mineralogist

Nevadaite

Comments: Robin's egg blue radiating acicular sprays of nevadaite to about 0.3 mm.
Location: Gold Quarry mine, Eureka Co., Nevada, USA. Scale: Picture size 2 cm.
© Tom Loomis / Dakota Matrix

Newberyite   Dittmarite

Comments: Translucent crystalline dittmaritewith more opaque newberyite.
Location: Skipton Caves, Victoria, Australia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Newberyite   Hannayite

Comments: Translucent white prismatic crystals of hannayite on brown newberyite.
Location: Skipton Caves, Victoria, Australia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Newberyite   Monetite

Comments: Tan coatings of monetite on white newberyite pseudomorphous after struvite crystal.
Location: Mono Lake, Mono County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Newberyite

Comments: Crudely formed crystal newberyite aggregate.
Location: Skipton Caves, near Balarat, Victoria, Australia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Neyite

Comments: Black foliated metallic neyite on quartz.
Location: near Hope, British Columbia, Canada. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Nezilovite

Comments: Small black grains of nezilovite in matrix.
Location: Nezilovo, FYR Macedonia. Scale: Picture size 1 mm.
© Thomas Witzke / Abraxas-Verlag

Nickel

Comments: Very small cubic crystal of native Nickel, isolated from an ore concentrate.
Location: Noum?a, New Caledonia. Scale: Crystal size 0.1 mm.
© Thomas Witzke / Abraxas-Verlag

Nickel-skutterudite

Comments: Gray, blocky crystals of nickel-skutterudite (chloanthite) with minor yellow pyrite.
Location: Gowganda, Ontario, Canada. Scale: Crystal size 3 mm.
© Tom Loomis / Dakota Matrix

Nickel-zippeite

Comments: Yellow crust of nickel-zippeite on matrix.
Location: Ronneburg U deposit, Gera district, Thuringia, Germany. Scale: Picture size 4 mm.
© Thomas Witzke / Abraxas-Verlag

Nickelhexahydrite

Comments: Pale greenish crust of ferroan nickelhexahydrite.
Location: Sohland, Bautzen, Oberlausitz, Saxony, Germany. Scale: Picture size 4 mm.
© Thomas Witzke / Abraxas-Verlag

Nickeline

Comments: Stubby, crude blocky crystals of nickeline.
Location: Gowaganda, Ontario, Canada. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Nickellotharmeyerite

Comments: Brown, microcrystalline nickellotharmeyerite.
Location: Pucher Shaft, Schneeberg District, Erzgebirge, Saxony, Germany. Scale: Picture size 1.5 mm.
© Thomas Witzke / Abraxas-Verlag

Nickelphosphide   Kamacite

Comments: Small inclusion of nickelphosphide in massive kamacite.
Location: Kenton County meteorite, Kenton Co., Kentucky, USA. Scale: Picture size 0.09 mm.
© Thomas Witzke / Abraxas-Verlag

Nickelschneebergite

Comments: Small crystals of nickelschneebergite.
Location: Roter Berg, Neust?dtel, Schneeberg District, Erzgebirge, Saxony, Germany. Scale: Picture size 2 mm.
© Thomas Witzke / Abraxas-Verlag

Nickenichite

Comments: Blue crystals of nickenichite on matrix.
Location: Nickenich, near Kruft, Eifel Mts, Rhineland-Palatinate, Germany. Scale: Picture size 2 mm.
© Thomas Witzke / Abraxas-Verlag

Nifontovite

Comments: Transparent spray of nifontovite crystals.
Location: Fuka Mine, Bicchu Town, Kawakama Co., Okayama Pref., Japan. Scale: Crystal size 2.3x0.7x0.5 cm.
© John Veevaert

Niigataite

Comments: Boulder consisting of prehenite, diaspore, chlorite and niigataite. The pale lavender is prehenite/diaspore and the very pale green is chlorite/niigataite..
Location: Itoigawa, river Kazuo, Niigata prefecture, Japan. Scale: Specimen size 19cm x 16 cm.
© American Mineralogist

Niigataite

Comments: Backscatter electronic image of niigataite (bright) which is partially replacing a chlorite (med gray) grain in a diaspore (dark gray, rod-shaped) and prehenite (light gray) matrix.
Location: Itoigawa, river Kazuo, Niigata prefecture, Japan. Scale: Picture size 5 mm.
© American Mineralogist

Nikischerite

Comments: Yellowish green nikischerite on matrix.
Location: Huanuni Mine, Dalence Province, Bolivia. Scale: Crystal size 5 mm.
© Tom Loomis / Dakota Matrix

Nikischerite

Comments: Tony Nikischer, Chairman of the Board of The Hudson Institute of Mineralogy, president of Excalibur Mineral Corporation, and the person whom nikischerite is named for, kindly provided the pronunciation of the mineral nikischerite.
Location: Executive Inn hotel, Room 128, Tucson, Feburary 9, 2004. Scale: NA.
© Dave Barthelmy

Nimite

Comments: Dark green nimite aggregates on white calcite.
Location: Planalto, Rio Grande do Sol, Brazil. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Ningyoite

Comments: Greenish-black fine grained ningyoite masses with minor rock.
Location: Ningyo-Toge Mine, Okayama, Japan. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Niobocarbide

Comments: Small metallic grain of niobocarbide.
Location: Nizhne-Tagil'skoye (Mednorudyanskoye) Cu Deposit, Nizhnii Tagil, Sverdlovskaya Oblast', Urals Region, Russia. Scale: Grain size 0.3 mm.
© Thomas Witzke / Abraxas-Verlag

Niobokupletskite   Kupletskite

Comments: Back-scattered electron image of Niobokupletskite (Nkpt) rimming kupletskite (Kpt). The zoning in the kupletskite is from Nb-poor to Nb-rich in the direction of the arrow (dark to medium gray). (CanMin v 38, p 628).
Location: Mont Saint-Hilaire, Quebec, Canada. Scale: Scale bar 100 µ-m.
© Canadian Mineralogist

Niobophyllite

Comments: Blackish-brown resinous to silky fibrous niobophyllite coatings on quartz.
Location: Seal Lake area, Labrador, Newfoundland, Canada. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Nissonite

Comments: Pale blue nissonite crusts on rock.
Location: Panoche Valley, San Benito County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Niter

Comments: Tan to white crystalline granular niter.
Location: Buffalo River Valley, Searcy County, Arkansas, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Nitratine   Iquiqueite

Comments: Yellow iquiqueiite in clear, massive nitration.
Location: Salar de Miraje, Antofagasta, Chile. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Nitratine

Comments: Euhedral crystalline aggregate of nitratine.
Location: Taltal, Antofagasta, Chile. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Nitromagnesite

Comments: Tan crystalline nitromagnesite grain, deliquescent.
Location: Baume, Jura, France. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Nobleite

Comments: Platy nobleite microcrystals on colemanite.
Location: Corkscrew Mine, Corkscrew Canyon, Death Valley, Inyo County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Noelbensonite

Comments: Brownish, massive no?lbensonite.
Location: Woods Mine (Wood's Rhodonite Mine), Tamworth, New South Wales, Australia. Scale: Picture size 1.2 mm.
© Thomas Witzke / Abraxas-Verlag

Nolanite

Comments: Dark gray to black massive nolanite.
Location: Fishhook Bay, Saskatchewan, Canada. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Nontronite

Comments: Green massive nontronite in quartz.
Location: Horni Slavkov, Zapadocesky, Czech Republic. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Norbergite

Comments: Numerous orange to orange-brown dipyramidal crystals of norbergite in white matrix.
Location: Piukkala, Near Pargas, Finland. Scale: 2.1 X 2.7 cm.
© John Veevaert

Norbergite

Comments: Yellow orange norbergite inclustions in white marble (calcite)..
Location: Oakssaung Hill, Mogok, Mandalay Myanmar. Scale: Crystal size 5 mm.
© Fabre Minerals

Nordenskioldine   Magnetite

Comments: Colorless to white bladed crystals of nordenski?ldine with black magnetite.
Location: P?hla-Tellerh?user Gallery, P?hla, Schwarzenberg District, Erzgebirge, Saxony, Germany. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Nordstrandite

Comments: Large pale brownish crystals of nordstrandite.
Location: B?renstein Quarry, Niederschlag, Oberwiesenthal, Erzgebirge, Saxony, Germany. Scale: Picture size 35 mm.
© Thomas Witzke / Abraxas-Verlag

Normandite

Comments: Divergent acicular normandite crystals in pegmatite.
Location: Mount Partomchorr, Khibiny Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Norrishite

Comments: Thin section photomicrograph showing norrishite (Nrs) associated with kornite (Krn), sugilite (Sgl), and Mn-rich pectolite (Pct) (AmMin 88:190).
Location: Silicate-rich sample from the Wessels mine, Kalahari manganese field, South Africa. Scale: Picture Size 2.4 mm.
© American Mineralogist

Northupite

Comments: Single octahedron of Northupite.
Location: Searles Lake, San Bernardino County, California, USA. Scale: Grain size 8 mm.
© Dave Barthelmy

Nosean

Comments: Stubby crystal of nosean on matrix.
Location: Mendig, Laacher See, Rhineland-Pal., Germany. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Novacekite   Metanovacekite

Comments: Yellow, translucent platy novacekite/metanovacekite crystal aggregate.
Location: Rabejac Mine, Olmet, Herault, France. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Novacekite

Comments: Scanner image of massive, yellow novacekite covering matrix.
Location: Serra das ?guas,Bahia, Northeast Region, Brazil. Scale: Specimen size 4.1 cm.
© Paul M. Schumacher

Novakite   Berzelianite

Comments: Gray metallic dendritic novakite in white calcite with tarnished black berzelianite.
Location: Cerny Dul, Bohemia, Vychodocesky, Czech Republic. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Novgorodovaite

Comments: A small fragment of the oxalate mineral novgorodovaite.
Location: Chelkar salt dome, Aksai Valley, Aqt?be Oblysy (Aktubinsk [Aktyubinsk; Aktubinskaya] Oblast'), Kazakhstan. Scale: Grain size 0.8 mm.
© Thomas Witzke / Abraxas-Verlag

Nsutite

Comments: Dark gray to black sub-metallic to dull massive nsutite.
Location: Nsuta, Western Province, Ghana. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Nukundamite   Covellite

Comments: Metallic brownish rim of nukundamite with dark purplish-blue covellite on fine-grained pyrite.
Location: Ronneburg U deposit, Gera district, Thuringia, Germany. Scale: Picture size 7 mm.
© Thomas Witzke / Abraxas-Verlag

Nyerereite   Gregoryite

Comments: Sodium (nyereteite) and potassium (gregoryite) carbonates, not stable in normal atmosphere, collected molten from the volcano and maintained in inert argon atmosphere.
Location: Ol Doinyo Lengai Vulkan, Maasai Steppe, East Africa Rift Valley, Tanzania. See Link. Scale: Rock size 2 cm.
© Richard Dale / Dale Minerals