's Image Gallery

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

Munirite: NaVO3·(2-x)(H2O)

Comments: Bright yellow-orange crystalline munirite on matrix.
Location: Brushy Creek, Uravan, Montrose County, Colorado, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Murataite: (Y,Na)6(Zn,Fe+++)5(Ti,Nb)12O29(O,F)14

Comments: Murataite (M) crystal in polished section showing cubic, form against quartz (Q). Other minerals are astrophyllite (A) and mineral Y (Y). (AmMin, v59:172).
Location: Small pegmatite in the St. Peters Dome area, El Paso County, Colorado, USA. Scale: See Image.
© American Mineralogist

Murdochite: PbCu6O8-x(Cl,Br)2x  
Smithsonite: ZnCO3

Comments: Dark metallic micro crystals of murdochite on pale blue-gray smithsonite crystal covered matrix.
Location: Silver Hill Mine group, Silver Hill, Waterman District, Waterman Mts, Pima Co., Arizona, USA. Scale: 5x4x2 cm.
© John Betts - Fine Minerals

Murmanite: (Na,[ ])2{(Na,Ti)4[Ti2(O,H2O)4Si4O14](OH,F)2}·2H2O

Comments: Metavolcanic matrix hosting several bright pink lath shaped crystals of murmanite.
Location: Ilimaussaq, Illua, Greenland. Scale: Crystal size 1.6 cm.
© John Veevaert

Muscovite: KAl2(Si3Al)O10(OH,F)2  
Apatite-(CaF): Ca5(PO4)3F  
Beryl: Be3Al2Si6O18  
Apatite: Ca5(PO4)3(OH,F,Cl)

Comments: Pink crystals of fluorapatite with pale blue beryl (aquamarine) on books of muscovite crystals.
Location: Nagar area, Gilgit district, Northern Areas, Pakistan. Scale: 3 x 3 cm.
© Dan Weinrich

Muscovite: KAl2(Si3Al)O10(OH,F)2

Comments: Pseudo-hexagonal crystalline aggregate of muscovite.
Location: Conselheiro Pena, Minas Gerais, Brazil. Scale: Crystal size 2 cm.
© Dave Barthelmy

Muscovite: KAl2(Si3Al)O10(OH,F)2

Comments: Seams of green muscovite var. fuchsite in quartz matrix with minor pyrite crystals.
Location: Wolfe's Neck locality, Freeport, Cumberland Co., Maine, USA. Scale: 7x5x4 cm.
© John Betts - Fine Minerals