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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