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Marianoite: Na2Ca4(Nb,Zr)2(Si2O7)2(O,F)4
Comments: PPL image of euhedral crystals of marianoite, titanite and U-rich pyrochlore in the phlogopite-calcite silicocarbonatite. (CanMin, v46:1023). Location: Mesoproterozoic Prairie Lake intrusive complex, in northwestern Ontario, Canada. Scale: See Image. © Canadian Mineralogist
Comments: SEM images showing the morphology of marianoite crystals, (CanMin, v46:1023). Location: Mesoproterozoic Prairie Lake intrusive complex, in northwestern Ontario, Canada. Scale: See Images. © Canadian Mineralogist
Maricite: NaFe++PO4 Vivianite: Fe++3(PO4)2·8(H2O)
Comments: Brown maricite nodule with internal radiating structure, with blue vivianite. Location: Big Fish River, Yukon Territory, Canada. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Maricopaite: Pb7Ca2(Si,Al)48O100·32(H2O)
Comments: Opaque white prismatic maricopaite microcrystals and yellow crystalline mimetite. Location: Moon Anchor Mine, near Tonopah, Maricopa County, Arizona, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Marinellite: [(Na,K)42Ca6](Si36Al36O144)(SO4)8Cl2·6(H2O)
Comments: Colorless to pale bluish-gray anhedral marinellite crystal. Location: Monte Cavalluccio, Sacrofano, Campagnano di Roma, Italy. Scale: See Image. © Rruff Database
Marokite: CaMn+++2O4
Comments: Dark brown crystalline massive marokite. Location: vein #2, Tachgagalt, Ouarzazet, Morocco. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Marrite: PbAgAsS3
Comments: A prismatic crystal of marrite with small rounded crystals of galena in quartz. Location: Lengenbach quarry, Binntal, Wallis (Valais), Switzerland. Scale: Picture size 1.3 mm. © Thomas Witzke / Abraxas-Verlag
Marrite: PbAgAsS3 Jordanite: Pb14(As,Sb)6S23
Comments: Aggregate of gray prismatic crystals of marrite on fine-grained jordanite. Location: Lengenbach quarry, Binntal, Valais, Switzerland. Scale: Picture high 5 mm. © Walter Gabriel
Marrucciite: Hg3Pb16Sb18S46
Comments: Black, acicular crystals of marrucciite embedded in dolomite marble.. Location: Buca della Vena Mine, Stazzema, Tuscany, Italy.. Scale: Picture size 4 mm. © Thomas Witzke
Marshite: CuI
Comments: Translucent tetragonal crystal of marshite on matrix. Location: Broken Hill, New South Wales, Australia. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Marsturite: NaCaMn3[Si5O14(OH)]
Comments: Orange scaly marsturite on matrix. Location: Molinello Mine, Val Graveglia, Genoa, Liguria, Italy. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Marthozite: Cu[(UO2)3(SeO3)2O2]·8(H2O)
Comments: Yellowish green coating of marthozite on matrix. Location: Musonoi Mine, Katanga, Democratic Republic of the Congo. Scale: Not Given. © John Veevaert
Comments: Olive green crystal of marthozite showing multiple face development on main crystal. Schumacher Collection. Location: Musonoi Mine, Kolwezi, Western area, Shaba Cu belt, Shaba (Katanga), Congo (Zaïre). Scale: Picture size 5 mm. © Paul M. Schumacher
Martinite: (Na,[ ],Ca)12Ca4(Si,S,B)14B2O38(OH,Cl)2F2·4(H2O)
Comments: Colorless, pseudohexagonal plate of martinite associated with sodalite and a clinoamphibole. (CanMin, v45:1281). Location: Poudrette quarry, Mont Saint-Hilaire, Quebec, Canada. Scale: Crystal size 40 µm. © Canadian Mineralogist
Martyite: Zn3V2O7(OH)2·2H2O
Comments: Clusters of yellow flakes and coarser red-orange plates of martyite on V-U replacement of organic material. Location: Blue Cap mine, near La Sal, San Juan County, Utah, USA. Scale: Picture size 1.4 mm. © Canadian Mineralogist
Mascagnite: (NH4)2SO4
Comments: White, botryoidal mascagnite. Location: Carola Mine, Freital, Dresden, Saxony, Germany. Scale: Picture size 6 mm. © Thomas Witzke / Abraxas-Verlag
Mascagnite: (NH4)2SO4 Lecontite: (NH4,K)Na(SO4)·2(H2O)
Comments: SEM BSE image of fine-grained lecontite (Le) and thenardite, occupying the space between mascagnite (M) crystals. CanMin 47:573. Location: Coal-waste heap in Avion, northern France, that has been undergoing subsurface combustion for several decades. Scale: See Image. © Canadian Mineralogist
Maslovite: PtBiTe Froodite: PdBi2 Altaite: PbTe
Comments: Reflected light photomicrograph of maslovite (M), froodite (F), and altaite (A), in chalcopyrite matrix. Location: Oktyabr'skoye Mine, Norilsk, Krasnoyarsk Territory, Siberia, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Massicot: PbO
Comments: Small nugget of reddish-yellow massicot. Location: Wytheville, Wythe Co., Virginia, USA. Scale: 18x10x5 mm. © John Betts - Fine Minerals
Massicot: PbO Litharge: PbO
Comments: Dark red litharge with brownish-yellow scaly massicot and white cerussite. Location: Patagonia, Santa Cruz County, Arizona, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species