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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
Mooihoekite: Cu9Fe9S16 Haycockite: Cu4Fe5S8
Comments: B&W polished section image of mooihoekite-haycockite intergrowth showing tarnished mooihoekite (mh) and haycockite (hc). The small whitest lamellar grains are mackinawite. Location: Hortonolite dunite (replacement,) pegmatite, Mooihoek Farm, Lydenburg District, Transvaal, South Africa. (AmMin, v57:689). Scale: See Image. © American Mineralogist
Moolooite: Cu++(C2O4)·n(H2O) (n < 1)
Comments: Light bluish moolooite encrustation. Location: Ibergstausee, Stempeda, Südharz, Thuringia, Germany. Scale: Picture size 0.9 mm. © Thomas Witzke / Abraxas-Verlag
Mooreite: (Mg,Zn,Mn)15(SO4)2(OH)26·8(H2O)
Comments: Translucent, wedge-shaped crystals of mooreite on matrix. Location: Franklin, Sussex County, New Jersey, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
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
Mopungite: NaSb(OH)6
Comments: White mopungite encrustations. Location: Cetine di Cotorniano Mine (Cetine Mine), Rosia, Siena, Tuscany, Italy. Scale: Picture size 7 mm. © Thomas Witzke / Abraxas-Verlag
Moraesite: Be2(PO4)(OH)·4(H2O)
Comments: Silky, tufted crystals of white moraesite on matrix. Location: Divino das Laranjeiras, Minas Gerais, Brazil. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
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
Mordenite: (Ca,Na2,K2)Al2Si10O24·7(H2O) Heulandite-Ca: (Ca,Na)2-3Al3(Al,Si)2Si13O36·12(H2O)
Comments: White, acicular crystals of mordenite in heulandite geode. Location: Rock Creek, Stevenson, Skamania County, Washington, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Comments: Pink heulandite crystals up to 15 mm in fibrous white mordenite matrix. Location: Rats Nest Claim, Challis, Custer Co., Idaho, USA. Scale: 6x6x4 cm. © John Betts - Fine Minerals
Morenosite: NiSO4·7(H2O)
Comments: Pale greenish blue crust of morenosite. Location: Gorner Glacier, Furi, Zermatt, Wallis (Valais), Switzerland. Scale: Picture size 5 mm. © Thomas Witzke / Abraxas-Verlag
Morimotoite: Ca3TiFe++Si3O12
Comments: Dark-brown morimotoite grains in calcite-wollastonite skarn from the type locality, ID confirmed by microprobe and XRD analyses. Location: Fuka mine, Bitchu-cho (Bicchu-cho), Takahashi, Okayama Prefecture, Chugoku Region, Honshu Island, Japan. Collected by Igor V. Pekov in 2007 under supervising of the specie author from the same point of the outcrop as and holotype specimen. Scale: Specimen Size 17x12x7 mm. © Pavel M. Kartashov
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
Comments: Sky blue spheroidal to globular cyrstals of cuprian morinite to 1mm with other phosphates. Location: Silver Coin Mine, Humboldt Co., Nevada, USA. Scale: Overall: 6 x 5 x 2.5 cm. © Tom Loomis / Dakota Matrix
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
Comments: Moschellandsbergite 4mm crystal on matrix. Location: Carolina Mine, Moschellandsberg, Obermoschel, Rhineland-Palatinate, Germany. Scale: Specimen Size 6.0 x 4.8 x 4.0 cm. © Rob Lavinsky
Mosesite: Hg2N(Cl,SO4,MoO4,CO3)·(H2O)
Comments: Yellow, hoppered crystal of mosesite on matrix. Location: Terllingua, Brewster County, Texas, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals