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Malachite: Cu2(CO3)(OH)2 Devilline: CaCu4(SO4)2(OH)6·3(H2O)
Comments: Blue crystals of devilline on green, botryoidal malachite. Location: Spania Dolina (Herrengrund), Slovakia. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Manasseite: Mg6Al2(CO3)(OH)16·4(H2O)
Comments: Brownish yellow crystal of manasseite on dolomite matrix. Location: Jacupiranga mine, Jacupiranga, Sao Paolo, Brazil. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Manganoneptunite: KNa2Li(Mn,Fe++)2Ti2Si8O24
Comments: Dark brown crystal of mangan-neptunite on matrix. Location: Kibblehouse quarry, Perkiomenville, Pennsylvania, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Marshite: CuI
Comments: Translucent tetragonal crystal of marshite on matrix. Location: Broken Hill, New South Wales, Australia. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Masuyite: Pb[(UO2)3O3(OH)2]·3(H2O)
Comments: Bright reddish orange crystals of masuyite. Location: Shinkolobwe mine, Tantara, Shaba, Democratic Republic of the Congo. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Matlockite: PbFCl
Comments: Pale cream colored rosettes of matlockite crystals on matrix. Location: Laurium, Greece. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Mcguinnessite: (Mg,Cu)2(CO3)(OH)2
Comments: Cotton ball clusters of vivid blue mcguinnessite crystals on matrix. Location: Miners Ridge, Red Mountain, Mendocino County, California, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Meionite: Ca4Al6Si6O24CO3
Comments: Clear meionite crystal on matrix. Location: Monte Somma (Vesuvius), Campania, Italy. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Melanophlogite: SiO2·n(C,H,O,S)
Comments: Yellow, transparent Melanophlogite crystals. Location: Racalmuto, Sicily, Italy. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Melilite: (Ca,Na)2(Al,Mg,Fe++)(Si,Al)2O7
Comments: Barrel-shaped root-beer colored melilite crystal with clear nepheline. Location: Udersdorf, Rhineland-Palatinate, Germany. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Mesolite: Na2Ca2Al6Si9O30·8(H2O)
Comments: Cotton-ball cluster of acicular white mesolite crystals on celestine. Location: Cheyenne, Laramie County, Wyoming. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Messelite: Ca2(Fe++,Mn)(PO4)2·2(H2O) Leucophosphite: KFe+++2(PO4)2(OH)·2(H2O)
Comments: White messelite crystals with greenish leucophosphite. Location: Tip Top mine, Custer, Custer County, South Dakota, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Meta-autunite: Ca(UO2)2(PO4)2·2-6(H2O)
Comments: Platy meta-autunite crystals fluorescing greenish yellow. Location: Carretona, Spain. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Metacinnabar: HgS
Comments: Spherical metacinnabar crystals on quartz. Location: Mt. Diablo mine, Contra Costa County, California, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Metakottigite: (Zn,Fe+++,Fe++)3(AsO4)2·8((H2O),OH)
Comments: Bladed crystalline sprays of metakottigite crystals on matrix. Location: Ojuela mine, Mapimi, Durango, Mexico. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Metaswitzerite: Mn3(PO4)2·4(H2O)
Comments: Bladed crystalline sprays of milk chocolate-colored metaswitzerite crystals. Location: Foote mine, Kings Mountain, Cleveland County, North Carolina, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Metatorbernite: Cu(UO2)2(PO4)2·8(H2O)
Comments: Green, square, tabular crystals of metatorbernite on matrix. Location: Wheal Basset, Illogan, Cornwall, England, UK. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Metatyuyamunite: Ca(UO2)2V2O8·3(H2O)
Comments: Bright yellow bladed crystals of metatyuyamunite. Location: Mashamba mine, Kolwezi, Shaba, Democratic Republic of the Congo. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Metauranocircite: Ba(UO2)2(PO4)2·6-8(H2O)
Comments: Yellow crystals of meta-uranocircite. Location: Krunkelbachtal, Baden-Wurttemberg, Germany. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Metavariscite: AlPO4·2(H2O)
Comments: Clear tabular crystals of metavariscite. Location: Utahlite claim, Lucin, Box Elder County, Utah, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals