's Image Gallery

Muscovite: KAl2(Si3Al)O10(OH,F)2  
Aluminoceladonite: KAl(Mg,Fe++)[ ]Si4O10(OH)2

Comments: Large, 1cm, purple crystals of muscovite/leucophyllite, (var. alurgite which is an intermediate composition to muscovite and leucophyllite (aluminoceladonite).
Location: Ultevis, Sweden. Scale: 5x3.5x3cm.
© Tom Loomis / Dakota Matrix

Mushistonite: (Cu,Zn,Fe)Sn++++(OH)6  
Kesterite: Cu2(Zn,Fe)SnS4

Comments: Sharp, kesterite crystal, greenish in color due to a mushistonite coating with clear, prismatic beryl crystals.
Location: Xue Bao Diang Mountains, north of Pingwu, Sichuan Province, China. Scale: Crystal size 1 cm.
© Dan Weinrich

Mushistonite: (Cu,Zn,Fe)Sn++++(OH)6

Comments: Green crystalline mushistonite coatings on quartz.
Location: Etta Mine, Keystone, Pennington County, South Dakota, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Muthmannite: AgAuTe2

Comments: Backscattered scanning electron microphotograph of muthmannite (light gray) rimming a sylvanite (dark gray) grain. (AmMin 89:1506).
Location: Museum specimen from a gold-telluride deposit of Sacarîmb, Metaliferi Mountains, western Romania.. Scale: See Image.
© American Mineralogist

Mutnovskite: Pb2AsS3(I,Cl,Br)

Comments: SEM of blocky crystals of mutnovskite. Needle-like crystals of unknown Pb-Bi-As halogensulfosalts, currently under study, appear on the left. AmMin, v91, p22.
Location: Mutnovsky volcano, Kamchatka Peninsula, Russian Federation. Scale: See Image.
© American Mineralogist

Nabalamprophyllite: Ba(Na,Ba){Na3Ti[Ti2O2Si4O14](OH,F)2}

Comments: Yellowish brown platy nabalamprophyillite cluster in matrix.
Location: Slyuda (mica) quarry, Kovdor, Kola Peninsula, Russia. Scale: See Image.
© Rruff Database

Nabaphite: NaBaPO4·9(H2O)

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: Na2BeSi4O10·4(H2O)

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

Nabokoite: Cu++7Te++++O4(SO4)5·KCl

Comments: Brown thin tabular plates, co-type material.
Location: Tolbachik Volcano, Kamchatka, Russia. Scale: See Image.
© Rruff Database

Nacaphite: Na(Na,Ca)2(PO4)F  
Thermonatrite: Na2CO3·(H2O)

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): NbNa3Ca3(Ce,La)(Si2O7)2OF3

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

Nacrite: Al2Si2O5(OH)4

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

Nadorite: PbSbO2Cl

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

Nafertisite: Na3(Fe++,Fe+++)6(Ti2Si12O34)(O,OH)7·2(H2O)

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

Nagashimalite: Ba4(V+++,Ti)4Si8B2O27Cl(O,OH)2

Comments: SEM image of a prismatic, striated nagashimalite crystal.
Location: Mogurazawa mine, Honshu, Kiryu, Gumma Prefecture, Japan. Scale: Scale Bar 0.05 mm.
© Mineralogical Journal

Nagashimalite: Ba4(V+++,Ti)4Si8B2O27Cl(O,OH)2

Comments: Dark olive green translucent to opaque bladed nagashimalite crystals on in pale pink rhodonite.
Location: Mogurazawa mine, Kiryuu City, Gunma Prefecture, Kanto Region, Honshu Island, Japan. Scale: Picture Size 3 mm.
© Jeff Weissman / Photographic Guide to Mineral Species

Nagelschmidtite: Ca7(SiO4)3(PO4)2

Comments: Upper - Transmitted light thin sections showing honey-brown nagelschmidtite. Lower - reflected light polished section showing nagelschmidtite (Nag), rankinite (Ran), Ti-rich androdite (Andr).
Location: Andradite-rich pegmatoid rock, Haturim Basin, Negev Desert, Israel. Scale: See Images.
© Diederik Visser

Nagyagite: AuPb(Sb,Bi)Te2-3S6

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

Nahcolite: NaHCO3

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

Nahcolite: NaHCO3  
Trona: Na3(CO3)(HCO3)·2(H2O)

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