Mineral Specimen Images (M)

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

Mullite: Al(4+2x)Si(2-2x)O(10-x) where x =0.17 to 0.59

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