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Molysite: Fe+++Cl3
Comments: Yellow earthy molysite coatings. Location: Sasso Pisano, Pisa, Tuscany, Italy. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Monetite: CaHPO4 Newberyite: Mg(PO3OH)·3(H2O)
Comments: Tan coatings of monetite on white newberyite pseudomorphous after struvite crystal. Location: Mono Lake, Mono County, California, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Monimolite: (Pb,Ca)2Sb2O7
Comments: Pale green monimolite crusts on matrix. Location: Altar, Sonora, Mexico. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Monohydrocalcite: CaCO3·(H2O)
Comments: Gray to pale blue, due to copper staining, botryoidal monohydrocalcite crust. Location: 40' level, Saint Pierre Mine, Sainte-Marie-aux-Mines, Vosges Mountains, Haute-Rhin, France. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Montdorite: (K,Na)(Fe++,Mn++,Mg)2.5[Si4O10](F,OH)2
Comments: Pale green fine granular montdorite in iron-stained matrix. Location: Charlunnes, Mont Dore, Puy-de-Dome, France. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Montesommaite: (K,Na)9Al9Si23O64·10(H2O)
Comments: Translucent prismatic montesommaite crystals in vugs. Location: Pollena Quarry, Vesuvius, Naples, Campania, Italy. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Monticellite: CaMgSiO4
Comments: Pale brown crystalline massive monticellite. Location: Crestmore Quarry, Riverside County, California, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Montmorillonite: (Na,Ca)0,3(Al,Mg)2Si4O10(OH)2·n(H2O)
Comments: Bright pink chalky massive montmorillonite. Location: Tamminen Quarry, Greenwood, Oxford County, Maine, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Montroseite: (V+++,Fe+++,V++++)O(OH)
Comments: Black silky fibrous montroseite on sandstone with tyuyamunite. Location: Monument No. 2 Mine, Kayenta, Apache County, Arizona, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Montroyalite: Sr4Al8(CO3)3(OH,F)26·10-11(H2O)
Comments: Translucent micro spherical montroyalite on matrix. Location: Francon Quarry, Montreal, Quebec, Canada. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Montroydite: HgO
Comments: Red to orange radial and crystalline montroydite aggregates on black calcite. Location: Terlingua, Brewster County, Texas, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Montroydite: HgO Pinchite: Hg++5O4Cl2
Comments: Minute lustrous black pinchite crystals on white montroydite. Location: Terlingua, Brewster County, Texas, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Mooihoekite: Cu9Fe9S16
Comments: Lighter toned brassy metallic mooihoekite masses in chalcopyrite with magnetite. Location: Oktyabr'skoye Mine, Norilsk, Krasnoyarsk Territory, Siberia, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Moorhouseite: (Co,Ni,Mn)SO4·6(H2O)
Comments: Pink crystalline moorhouseite in sandstone. Location: Cameron, Coconino County, Arizona, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Moraesite: Be2(PO4)(OH)·4(H2O) Glucine: CaBe4(PO4)2(OH)4·0.5(H2O)
Comments: Light brown glucine with white moraesite. Location: Boevskoye Mine, Sverdlovsk District, Middle Urals, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Morinite: NaCa2Al2(PO4)2(F,OH)5·2(H2O)
Comments: Pale violet crystalline morinite in white crystalline fluorapatite. Location: Hugo Mine, Keystone, Pennington County, South Dakota, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Mosandrite: Na(Na,Ca)2(Ca,Ce,Y)4(Ti,Nb,Zr)(Si2O7)2(O,F)2F3
Comments: Yellow to brown resinous crystalline mosandrite with black aegirine. Location: Khibiny Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Moschellandsbergite: Ag2Hg3
Comments: Gray metallic dendritic moschellandsbergite aggregate. Location: Moschellandsberg, Rheinland-Pfalz, Germany. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
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
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