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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
Metavauxite: Fe++Al2(PO4)2(OH)2·8(H2O)
Comments: Clear acicular crystals of metavauxite. Location: Llallagua, Potosi Department, Bolivia. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Metazeunerite: Cu(UO2)2(AsO4)2·8(H2O)
Comments: Lime green crystals of metazeunerite on matrix. Location: Schneeberg, Saxony, Germany. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Miargyrite: AgSbS2
Comments: Metallic miargyrite crystal on quartz. Location: Braunsdorf, Saxony, Germay. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Miersite: (Ag,Cu)I
Comments: Translucent miersite crystals on matrix. Location: Broken Hill, New South Wales, Australia. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Milarite: K2Ca4Al2Be4Si24O60·(H2O)
Comments: Single transparent crystal of yellow Milarite. Location: Near Rossing, Namibia. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Millerite: NiS
Comments: Fragile, acicular crystals of metallic yellow millerite in a vug. Location: Hall's Gap, Lincoln County, Kentucky, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Millisite: (Na,K)CaAl6(PO4)4(OH)9·3(H2O)
Comments: Milky cream-colored crystals of millisite. Location: Clay Canyon, Fairfield, Utah County, Utah, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals