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Mottanaite-(Ce): Ca4(Ce,Ca)2AlBe2[Si4B4O22]O2
Comments: Brown crystals of mottanaite-(Ce) in matrix. Location: Monte Cavallucio, Sacrofano, Campagnano, Latium (Lazio), Italy. Scale: Picture size 5 mm. © Thomas Witzke / Abraxas-Verlag
Mottramite: PbCu(VO4)(OH) Beaverite: PbCu++(Fe+++,Al)2(SO4)2(OH)6
Comments: Specimen of quartz with a thick druse of green mottramite (cuprodescloizite) crystals and a scattered grouping of micro beaverite crystals (lemon yellow in color). Location: Tsumeb Mine, Tsumeb, Namibia. Scale: 3.3 x 2.5 cm. © John Veevaert
Mottramite: PbCu(VO4)(OH)
Comments: Botryoidal green mottramite on white calcite. Location: Tsumeb Mine,Tsumeb, Namibia. Scale: 7.5 cm by 8 cm. © Kevin Ward
Motukoreaite: Na2Mg38Al24(CO3)13(SO4)8(OH)108·56(H2O)
Comments: Colorless, tabular crystals of motukoreaite. Location: Stradnerkogel Quarry, Wilhelmsdorf, Styria, Austria. Scale: Picture size 1.5 mm. © Thomas Witzke / Abraxas-Verlag
Mounanaite: PbFe+++2(VO4)2(OH)2
Comments: Yellow crystal of mounanaite on matrix. Location: Mounana, Haut-Ogoue, Gabon. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Mounanaite: PbFe+++2(VO4)2(OH)2 Francevillite: (Ba,Pb)(UO2)2V2O8·5(H2O)
Comments: Stout, yellow, transparent, prismatic, striated crystals of francevillite on brownish red mounanaite matrix. Location: Mounana mine, Franceville, Haut-Ogooué, Gabon. Scale: Picture size 1.5 cm. © Paul M. Schumacher
Mountainite: (Ca,Na2,K2)2Si4O10·3(H2O) Raite: Na4Mn++4Si8(O,OH)24·9(H2O)
Comments: Bright white fibrous acicular mountainite crystal aggregate with pale golden raite. Location: Lovozero Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Mountkeithite: (Mg,Ni)11(Fe+++,Cr)3(SO4,CO3)3.5(OH)24·11(H2O)
Comments: Pinkish mountkeithite grain in matrix. Location: Mount Keith nickel deposit, Western Australia, Australia. Scale: Picture size 2 mm. © Thomas Witzke / Abraxas-Verlag
Mourite: U++++Mo++++++5O12(OH)10 Iriginite: (UO2)(Mo++++++2O7)·3(H2O)
Comments: Purple to violet sub-metallic mourite coatings with yellow iriginite. Location: 'North Caucasus', probably Kyzylsai Deposit, Chu-Ili Mountains, Balkhash, Zezkazgan, Kazakhstan. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Mozartite: CaMn+++SiO4(OH)
Comments: Massive, crystalline mozartite. Location: Wessels Mine, Kalahari Manganese Field, Northern Cape Province, South Africa. Scale: 9.5 x 9.7 cm. © John Veevaert
Mozgovaite: PbBi4(S,Se)7
Comments: B&W image of a polished section.The black matrix is epoxy. The black spots on the crystal are the trace of microhardness indenter. Location: Fumarole in La Fossa crater on Vulcano, Aeolian Islands, Italy. (CanMin v37:1499). Scale: Crystal Length 165 µm. © Canadian Mineralogist
Mpororoite: Al(WO3)(OH)3·2(H2O) Anthoinite: AlWO3(OH)3
Comments: White chalky massive mpororoite with brown anthoinite. Location: Kara Mine, Tasmania, Australia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Mrazekite: Bi+++2Cu++3(PO4)2O2(OH)2·2(H2O)
Comments: Blue, prismatic crystal of mrázekite on matrix. Location: Arme Hilfe Mine, Ullersreuth, Hirschberg, Vogtland, Saxony, Germany. Scale: Picture size 1.2 mm. © Thomas Witzke / Abraxas-Verlag
Mroseite: CaTe++++(CO3)O2
Comments: White, flaky patches of mroseite in complex ore matrix. Location: Bambolla Mine, Moctezuma, Sonora, Mexico. Scale: Not Given. © Rob Lavinsky
Muckeite: CuNiBiS3
Comments: Dark gray tabular crystals of Mückeite. Location: Grüneau Mine (Grüne Au Mine; Grünau Mine), Schutzbach, Betzdorf, Siegen District (W), Rhineland-Palatinate, Germany. Scale: Picture size 5 mm. © Thomas Witzke / Abraxas-Verlag
Muirite: Ba10Ca2Mn++TiSi10O30(OH,Cl,F)10 Sanbornite: BaSi2O5
Comments: Translucent orange crystalline muirite in sanbornite. Location: Big Creek, Fresno County, California, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Mullite: Al(4+2x)Si(2-2x)O(10-x) where x =0.17 to 0.59
Comments: Opaque white mullite masses with mica. Location: Nijar, Almeria, Andalucia, Spain. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Comments: Surface of a kaolinite stratum altered to white mullite by a prehistoric coal-seam-fire.. Location: Mt. Wingen (Burning Mountain), NSW, Australia. Scale: Picture size 6x4 cm. © Dave Barthelmy
Munakataite: Pb2Cu2(Se++++O3)(SO4)(OH)4
Comments: Light blue fiberous crystals of munakataite with green malachite. (Journal Mineralogical and Petrological Sci., v103:327). Location: Kato mine, Munakata City, Fukuoka Prefecture, Japan. Scale: Picture size 1.8 mm. © Journal of Mineralogical and Petrological Sciences
Mundite: Al(UO2)3(PO4)2(OH)3·5(H2O)
Comments: Bright yellow crystalline mundite grains. Location: Kobokobo, Sud-Kivu, Zaire. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species