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Magnesiotaramite: Na(CaNa)Mg3ALFe+++[Si6Al2O22](OH)2
Comments: Dark blue granular massive magnesiotaramite. Location: Liset, Selje, Sogn og Fjordane, Norway. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Magnesiozippeite: Mg(H2O)3.5(UO2)2(SO4)O2 Marecottite: Mg3(H2O)18[(UO2)4O3(SO4)2]2·10(H2O)
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
Magnesite: MgCO3
Comments: Magnesite crystal group. The crystals have rhombic habit. The largest on this specimen is 3.7 cm across. Location: Brumado Mine, Bahia, Brazil. Scale: Photo by John Veevaert. © John Veevaert
Magnetite: Fe++Fe+++2O4
Comments: Black, opaque octahedral crystals of magnetite on matrix. Location: Isle of Ischia, near Naples, Compania, Italy. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Magnetite: Fe++Fe+++2O4 Nordenskioldine: CaSnB2O6
Comments: Colorless to white bladed crystals of nordenskiöldine with black magnetite. Location: Pöhla-Tellerhäuser Gallery, Pöhla, Schwarzenberg District, Erzgebirge, Saxony, Germany. Scale: Picture size 5 mm. © Thomas Witzke / Abraxas-Verlag
Magnetite: Fe++Fe+++2O4 Chesterite: (Mg,Fe++)17Si20O54(OH)6
Comments: Green platy chesterite in black, metallic magnetite. Location: Near Missoula, Missoula County, Montana, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Magnetoplumbite: Pb(Fe+++,Mn+++)12O19
Comments: Black magnetoplumbite masses in calcite. Location: Langban, Varmland, Sweden. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Magniotriplite: (Mg,Fe++,Mn)2(PO4)F
Comments: Red-brown crystalline magniotriplite masses in pegmatite. Location: Kyrk-Bulak pegmatite, Turkestanskij Range, Os, Kyrgyzstan. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Magnussonite: Mn++5As+++3O9(OH,Cl)
Comments: Bright green crystalline magnussonite grains with willemite. Location: Sterling Mine, Ogdensburg, Sussex County, New Jersey, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Mahnertite: (Na,Ca)Cu++3(AsO4)2Cl·5(H2O)
Comments: Blue mahnertite in quartz. Location: Cap Garonne Mine, Pradet, Var, Provence-Alpes-Côte d'Azur, France. Scale: Picture size 1.5 mm. © Thomas Witzke / Abraxas-Verlag
Majorite: Mg3(Fe,Al,Si)2(SiO4)3 Lingunite: (Na,Ca)AlSi3O8 Ringwoodite: Mg2SiO4
Comments: BSE image showing chondritic xenoliths and impact melt veins of lingunite (Lgt). Olivine (Olv), pyroxene (Pyx), maskelynite (Ms glass), ringwoodite (Rgt), and majorite (Mjt). Meteoritics & Planetary Science 43, No 5, 823-828 (2008). Location: Polished thin section of the Sixiangkou meteorite. Scale: See Image. © Meteoritics & Planetary Science
Makarochkinite: Ca2Fe++4Fe+++TiSi4BeAlO20
Comments: Black grain of makarochkinite on matrix. Location: Pit No. 400, Lake Ishkul', Ilmen Mts, Chelyabinsk Oblast', Urals Region, Russia. Scale: Specimen Size 0.5 cm x 0.5 cm. © Carlo Guidarin
Makatite: Na2Si4O8(OH)2·4(H2O)
Comments: Thin white bladed crystals of makatite. Location: Aris Phonolite, S. of Windhoek, Namibia. Scale: 5.5 x 3 cm. © John Veevaert
Comments: White acicular sprays of makatite crystals in a vug with pink villiaumite. Location: Aris Phonolite, Namibia. Scale: Picture size 2 cm. © Sandro Maggia/Minernet.it
Makovickyite: Ag1.5Bi5.5S9 Cupromakovickyite: Cu4AgPb2Bi9S18
Comments: SEM polished section detail of a grain of cupromakovickyite (dark gray) with locally exsolved lamellae (bright gray) of makovickyite. (CanMin, 46:503). Location: Baita Bihor, Romania.. Scale: See Image. © Canadian Mineralogist
Malachite: Cu2(CO3)(OH)2 Azurite: Cu3(CO3)2(OH)2
Comments: Dark blue stubby pyramidal azurite crystals and green botryoidal-shaped radial aggregates of malachite. Location: Nevada Lode Mine, San Juan Co., Utah, USA. Scale: 4 cm. © Dave Barthelmy
Malachite: Cu2(CO3)(OH)2 Demesmaekerite: Pb2Cu5(UO2)2(SeO3)6(OH)6·2(H2O)
Comments: Pale green crystals of demesmaekerite on dark green malachite. Location: Musonoi Mine, Katanga, Democratic Republic of the Congo. Scale: Crystal Size 3mm. © John Veevaert
Malachite: Cu2(CO3)(OH)2 Devilline: CaCu4(SO4)2(OH)6·3(H2O)
Comments: Blue crystals of devilline on green, botryoidal malachite. Location: Spania Dolina (Herrengrund), Slovakia. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Malachite: Cu2(CO3)(OH)2
Comments: Botryoidal malachite. Location: Mindigi, Shaba, Congo. Scale: 7.5 x 5.5 cm. © Fabre Minerals
Malanite: Cu(Pt,Ir)2S4
Comments: Epoxy grain mount of silver gray metallic polished fragment of malanite. Location: Placer concentrate from Philipp Massif, Kamchatka, Russia. Scale: See Image. © Rruff Database