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Manganohornesite: (Mn,Mg)3(AsO4)2ˇ8(H2O)
Comments: Micro, white, needles of manganese-hornesite to about 0.75mm on hausmannite-rich matrix. Location: Langban, Varmland, Sweden. Scale: 5.5 x 4 x 2.5cm. © Tom Loomis / Dakota Matrix
Manganokhomyakovite: Na12Sr3Ca6Mn3Zr3W(Si25O73)(O,OH,H2O)3(OH,Cl)2
Comments: Pseudo-octahedral Manganokhomyakovite crystals. (CanMin, v37:893). Location: Mont Saint-Hilaire, Quebec, Canada. Scale: Crystal Size 0.51 mm. © László Horváth / Canadian Mineralogist
Manganokukisvumite: Na6MnTi4Si8O28ˇ4(H2O)
Comments: Scanning electron photomicrograph of manganokukisvumite. (CanMin, v 42 , p 782). Location: Mont Saint-Hilaire, Quebec. Scale: See Image. © Canadian Mineralogist
Manganoneptunite: KNa2Li(Mn,Fe++)2Ti2Si8O24
Comments: Dark brown crystal of mangan-neptunite on matrix. Location: Kibblehouse quarry, Perkiomenville, Pennsylvania, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Manganoneptunite: KNa2Li(Mn,Fe++)2Ti2Si8O24 Shkatulkalite: {(Na,Mn,Ca,[ ])4[Nb2(O,H2O)4Si4O14](OH,F)2}ˇ2(H2O,[ ])
Comments: Pearly white shkatulkalite with brown mangan-neptunite grains. Location: Shkatulka pegmatite, Umbozero mine, Alluaiv Mt, Lovozero Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: Picture size 4.5 mm. © Thomas Witzke / Abraxas-Verlag
Manganonordite-(Ce): Na3SrCeMn++Si6O17
Comments: Light brown radial aggregates of manganonordite-(Ce) in ussingite. Location: Mt. Punkuruaiv, Lovozero, Kola Peninsula, Russia. Scale: Not Given. © Diederik Visser
Manganosite: MnO
Comments: Dark green manganosite in matrix. Location: Nordmark, Filipstad, Värmland, Sweden. Scale: Picture size 3.5 mm. © Thomas Witzke / Abraxas-Verlag
Manganotychite: Na6(Mn++,Fe++,Mg)2(SO4)(CO3)4 Aegirine: NaFe+++Si2O6
Comments: Pale rose-tan granular manganotychite with black aegirine prism. Location: Lovozero Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Manganvesuvianite: Ca19Mn+++(Al,Mn+++,Fe+++)10(Mg,Mn++)2Si18O69(OH)9
Comments: Dark cherry red prismatic, crystals or manganvisuvianite to 2mm on matrix. Location: N'Chwanning mine, Kalahari Mn Field, North Cape Province, South Africa. Scale: Picture size 5 mm. © Tom Loomis / Dakota Matrix
Manjiroite: (Na,K)(Mn++++,Mn++)8O16ˇn(H2O)
Comments: Dark brownish black massive sample of manjiroite. Location: Arizona, USA. Scale: 3.8 X 5.6 cm. © John Veevaert
Mannardite: BaTi6V+++2O16ˇ(H2O)
Comments: Prismatic crystals of black, metallic lustered mannardite crystals in matrix. Location: Kechica River, British Columbia, Canada. Scale: 3.4 X 4.5 cm. © John Veevaert
Mansfieldite: AlAsO4ˇ2(H2O)
Comments: White, spherical aggregates of mansfieldite. Location: Cap Garonne Mine, Pradet, Var, Provence-Alpes-Côte d'Azur, France. Scale: Picture size 7 mm. © Thomas Witzke / Abraxas-Verlag
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. © Fabre Minerals
Marecottite: Mg3(H2O)18[(UO2)4O3(SO4)2]2ˇ10(H2O)
Comments: SEM image of a typical marecottite aggregate. Note the perfect cleavage along (011) and the trace of the twin composition plane (arrow). (AmMin, v 88, p 678). Location: La Creusaz, Swiss Alps. Scale: See Image. © American Mineralogist
Marecottite: Mg3(H2O)18[(UO2)4O3(SO4)2]2ˇ10(H2O) Magnesiozippeite: Mg(H2O)3.5(UO2)2(SO4)O2
Comments: Powdery and crystalline aggregates of red-brown marecottite and yellow magnesiozippeite on matrix. Location: Svornost Mine, Jachymov, Bohemia, Czech Republic. Scale: Specimen Size 6.5x9 cm. © Diederik Visser
Margaritasite: (Cs,K,H3O)2(UO2)2V2O8ˇ(H2O)
Comments: Bright yellow earthy margaritasite crust on rhyolite. Location: Margaritas Open Pit Mine, Sierra Pena Blanca, Chihuahua,. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Margarite: CaAl2(Al2Si2)O10(OH)2
Comments: Beige, massive, fibrous/foliated aggregate of margarite crystals. Location: Long Hill/Old Tungsten Mine in Trumbull, Connecticut, USA. Scale: 10 x 5 cm. © Walter Mroch / Gem and Mineral Exploration Company
Margarosanite: Pb(Ca,Mn++)2Si3O9 Minehillite: (K,Na)2-3Ca28(Zn4Al4Si40)O112(OH)16 Wollastonite-1A: CaSiO3
Comments: White pearly crystalline minehillite with white margarosanite and dark gray lead, in pale pink opaque wollastonite (distinguished by blue-white fluorescence). Location: Franklin, Sussex County, New Jersey, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Margarosanite: Pb(Ca,Mn++)2Si3O9
Comments: Clear or white, long, thin bladed crystals of margarosanite on matrix. Location: Langban, Varmland, Sweden. Scale: Crystal size 1cm. © Tom Loomis / Dakota Matrix
Marialite: Na4Al3Si9O24Cl
Comments: Fully terminated 4.3 cm crystal of marialite. Weakly fluorescent red under SW UV light. Location: Gooderham, Haliburton Co., Ontario, Canada. Scale: 6 x 1.5 cm. © John Veevaert