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Maricite: NaFe++PO4 Vivianite: Fe++3(PO4)2·8(H2O)
Comments: Brown maricite nodule with internal radiating structure, with blue vivianite. Location: Big Fish River, Yukon Territory, Canada. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Maricopaite: Pb7Ca2(Si,Al)48O100·32(H2O)
Comments: Opaque white prismatic maricopaite microcrystals and yellow crystalline mimetite. Location: Moon Anchor Mine, near Tonopah, Maricopa County, Arizona, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Marokite: CaMn+++2O4
Comments: Dark brown crystalline massive marokite. Location: vein #2, Tachgagalt, Ouarzazet, Morocco. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Marsturite: NaCaMn3[Si5O14(OH)]
Comments: Orange scaly marsturite on matrix. Location: Molinello Mine, Val Graveglia, Genoa, Liguria, Italy. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Maslovite: PtBiTe Froodite: PdBi2 Altaite: PbTe
Comments: Reflected light photomicrograph of maslovite (M), froodite (F), and altaite (A), in chalcopyrite matrix. Location: Oktyabr'skoye Mine, Norilsk, Krasnoyarsk Territory, Siberia, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Massicot: PbO Litharge: PbO
Comments: Dark red litharge with brownish-yellow scaly massicot and white cerussite. Location: Patagonia, Santa Cruz County, Arizona, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Masutomilite: K(Li,Al,Mn++)3[(Si,Al)4O10](F,OH)2
Comments: Transparent to translucent micaceous pale violet masutomilite with yellow iron stains. Location: Hisu Kawa Mine, Gifu, Japan. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Matildite: AgBiS2
Comments: Gray platy metallic crystalline matildite in white quartz. Location: Sullivan Mountain, Montezuma District, Summit County, Colorado, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Mattagamite: CoTe2 Altaite: PbTe Tellurantimony: Sb2Te3
Comments: Silvery metallic intergrowths of mattagamite with tellurantimony and altaite. Location: Mattagami Lake Mine, Quebec, Canada. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Matulaite: CaAl18(PO4)12(OH)20·28(H2O)
Comments: Opaque white pearly crystalline matulaite coating on quartz and brown limonite. Location: Bachman Iron Mine, Hellertown, Northampton County, Pennsylvania, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Maucherite: Ni11As8 Argentopentlandite: Ag(Fe,Ni)8S8
Comments: Reflected light image of a polished section containing argentopentlandite (AgP) with galena (G), native silver (Ag), chalcopyrite (Ch) and maucherite (M). Location: Silver City, Ontonagon Co., Michigan, USA. Scale: Picture Size 900 µm. © Jeff Weissman / Photographic Guide to Mineral Species
Mawbyite: Pb(Fe+++Zn)2(AsO4)2(OH,H2O)2
Comments: Brown crystalline mawbyite in quartz. Location: Kintore Open Cut, Broken Hill, New South Wales, Australia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Mawsonite: Cu+6Fe+++2Sn++++S8
Comments: Mawsonite inclusions in brassy yellow chalcopyrite. Location: Mount Lyell, Queenstown, Tasmania, Australia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Maxwellite: NaFe+++(AsO4)F
Comments: Minute red translucent maxwellite crystal in rhyolite. Location: Squaw Creek Tin Mine, Black Range, Catron County, New Mexico, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Mazzite-Mg: K2CaMg2(Al,Si)36O72·28(H2O)
Comments: Clear colorless microcrystals and crystalline mazzite in vug. Location: Mont Simiol, Loire, France. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Mcallisterite: Mg2B12O14(OH)12·9(H2O)
Comments: Tan to white opaque porous aggregate of mcallisterite. Location: Qinghai, China. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Mcgillite: (Mn,Fe++)8Si6O15(OH)8Cl2
Comments: Pink crystalline mcgillite with galena. Location: Near Kimberley, Kootenay District, British Columbia, Canada. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Mcgovernite: Mn9Mg4Zn2As2Si2O17(OH)14
Comments: Golden sub-metallic micaceous mcgovernite with black franklinite, red willemite, and white calcite. Location: Franklin, Sussex County, New Jersey, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Mcguinnessite: (Mg,Cu)2(CO3)(OH)2 Vuagnatite: CaAlSiO4(OH)
Comments: Translucent colorless vuagnatite microcrystals with mcguinnessite. Location: Near Red Mountain, Mendocino County, California, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Mckinstryite: (Ag,Cu)2S Silver: Ag
Comments: Black metallic massive mckinstryite with wire silver. Location: Peregrina Mine, Guanajuato, Mexico. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species