Mineral Specimen Images (M)

Miserite: K1.5-x(Ca, Y,REE)5[Si6O15][Si2O7](OH,F)2·yH2O

Comments: Silky crystalline inclusions of maroon-colored miserite with a dark amphibole and white feldspar.
Location: Hodza, Achkan, Kyrgyzstan. Scale: 4.9 x 3.9 cm.
© John Veevaert

Mitridatite: Ca2Fe+++3(PO4)3O2·3(H2O)

Comments: Dark brown crystals of mitridatite on whitlockite.
Location: Tip Top mine, Custer, Custer County, South Dakota, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Mitryaevaite: Al5[(PO4)2[(P,S)O3(OH,O)]2F2(OH)2(H2O)8·6.48(H2O)

Comments: Small grain of white mitryaevaite on sample holder.
Location: Northwestern Karatau range, Kazakhstan. Scale: Peg Size 2 mm.
© Sergey Vasiliev / Systematic Mineralogy

Mixite: BiCu6(AsO4)3(OH)6·3(H2O)

Comments: Vuggy quartz matrix with green radial sprays of mixite crystals.
Location: Northern Star mine, Tintic district, Utah, USA. Scale: 6 x 5 x 4 cm.
© John Veevaert

Moctezumite: Pb(UO2)(TeO3)2

Comments: Orange crystals of moctezumite on matrix.
Location: Moctezuma, Mun. de Moctezuma, Sonora, Mexico. Scale: Picture size 4 mm.
© Thomas Witzke / Abraxas-Verlag

Moctezumite: Pb(UO2)(TeO3)2  
Burckhardtite: Pb2(Fe+++,Mn+++)Te++++(AlSi3O10)O2(OH)2·(H2O)

Comments: Pink crusts of burckhardtite with yellow crystalline moctezumite on quartz.
Location: Moctezuma Mine, Moctezuma, Sonora, Mexico. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Modderite: (Co,Fe)As

Comments: Synthetic crystal of modderite grown for study of this extremely rare mineral.
Location: None, grown in a laboratory. Scale: Grain size 100 µ-m.
© Katie Phillips / Vassar College

Moeloite: Pb6Sb6S14(S3)

Comments: Dark gray, metallic grains of moelite on white dolomite.
Location: Cava Ceragiola, Seravezza, Lucca, Italy. Scale: Picture size 2 cm.
© Dave Barthelmy

Mohrite: (NH4)2Fe++(SO4)2·6(H2O)

Comments: Opaque botryoidal mohrite aggregate.
Location: Saint Etienne, Layonnais, Languedoc, Loire, France. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Moissanite: SiC

Comments: Gemmy, platy crystal of moissanite shown with largest (001) face. The arrow indicates a drop-shaped, black metallic inclusion. (AmMin, 88:1818).
Location: Found in a cobble at a beach along the Turkish coast of the Mediterranean Sea, around 150 km NW from Izmir, and is most likely derived from Tertiary volcanic rocks outcropping in the area. Scale: Scale bar 300 µ-m.
© American Mineralogist

Moissanite: SiC  
Silicon: Si

Comments: Backscattered electron image of metallic inclusion in moissanite (SiC). The gray shading in the BSE mage consists mainly of pure silicon (Si metal). The brighter areas are composed of Fe-silicide. (AmMin, 88:1818).
Location: Found in a cobble at a beach along the Turkish coast of the Mediterranean Sea, around 150 km NW from Izmir, and is most likely derived from Tertiary volcanic rocks outcropping in the area. Scale: Scalebar 200 µ-m.
© American Mineralogist

Moluranite: H4U++++(UO2)3(MoO4)7·18(H2O)

Comments: Dark gray-black moluranite coatings on sandstone.
Location: La Sal, San Juan County, Utah, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Molybdenite: MoS2

Comments: Sharp metallic molybdenite crystal on matrix.
Location: Crown Point Mine, Washington. Scale: 4x4x2.3 cm.
© Isaias Casanova / IC Minerals

Molybdite: MoO3

Comments: Greenish yellow molybdite crust on quartz.
Location: Siberia, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Molybdofornacite: Pb2Cu[(As,P)O4][(Mo,Cr)O4](OH)

Comments: Lime green, tabular crystals of molybdofornacite on matrix.
Location: Mahoney district, Tres Hermanas Mountains, Luna County, New Mexico, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Molysite: Fe+++Cl3

Comments: Yellow earthy molysite coatings.
Location: Sasso Pisano, Pisa, Tuscany, Italy. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Monazite-(Ce): (Ce,La,Nd,Th)PO4

Comments: Orange crystals of monazite-(Ce) on lepidolite.
Location: Conselheiro Pena, Minas Gerais, Brazil. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Monazite-(La): (La,Ce,Nd)PO4

Comments: Yellowish crystals of monazite-(La) in a cavity in nephelin-syenite pegmatite.
Location: Kuivchorr Mt, Lovozero Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: FOV is 9x7 mm.
© Pavel M. Kartashov

Monazite-(Sm): SmPO4

Comments: Back-scattered electron image of the main aggregate of monazite-(Sm) and manganocolumbite (C) embedded in quartz (black). Variations in brightness of the monazite-(Sm) are controlled by the Th content, whereas the ratio Nb/Ta affects manganotantalite.
Location: Annie Claim #3 pod, Greer Lake intrusion, Archean Bird River Subprovince of the Superior Province, Southeastern Manitoba, Canada. Scale: Grain size 0.8 mm.
© Canadian Mineralogist

Moncheite: (Pt,Pd)(Te,Bi)2  
Chalcopyrite: CuFeS2

Comments: White moncheite with chalcopyrite (orange, blue and violet tarnishing colors) in silicate matrix. Polished section (from microprobe analysis) in reflected light.
Location: Lukkulaisvaara ultrabasic Massif, Olanga (Oulanka) River, Oulanka plutonic complex, Karelia Republic, Northern Region, Russia. Scale: Picture size 0.11 mm.
© Thomas Witzke / Abraxas-Verlag