Mineral Specimen Images (M)

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

Makatite: Na2Si4O8(OH)2·4(H2O)

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