Mineral Specimen Images (M)

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

Muscovite: KAl2(Si3Al)O10(OH,F)2  
Aluminoceladonite: KAl(Mg,Fe++)[ ]Si4O10(OH)2

Comments: Large, 1cm, purple crystals of muscovite/leucophyllite, (var. alurgite which is an intermediate composition to muscovite and leucophyllite (aluminoceladonite).
Location: Ultevis, Sweden. Scale: 5x3.5x3cm.
© Tom Loomis / Dakota Matrix

Mushistonite: (Cu,Zn,Fe)Sn++++(OH)6  
Kesterite: Cu2(Zn,Fe)SnS4

Comments: Sharp, kesterite crystal, greenish in color due to a mushistonite coating with clear, prismatic beryl crystals.
Location: Xue Bao Diang Mountains, north of Pingwu, Sichuan Province, China. Scale: Crystal size 1 cm.
© Dan Weinrich

Mushistonite: (Cu,Zn,Fe)Sn++++(OH)6

Comments: Green crystalline mushistonite coatings on quartz.
Location: Etta Mine, Keystone, Pennington County, South Dakota, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Muthmannite: AgAuTe2

Comments: Backscattered scanning electron microphotograph of muthmannite (light gray) rimming a sylvanite (dark gray) grain. (AmMin 89:1506).
Location: Museum specimen from a gold-telluride deposit of Sacarîmb, Metaliferi Mountains, western Romania.. Scale: See Image.
© American Mineralogist

Mutnovskite: Pb2AsS3(I,Cl,Br)

Comments: SEM of blocky crystals of mutnovskite. Needle-like crystals of unknown Pb-Bi-As halogensulfosalts, currently under study, appear on the left. AmMin, v91, p22.
Location: Mutnovsky volcano, Kamchatka Peninsula, Russian Federation. Scale: See Image.
© American Mineralogist