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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
Mimetite: Pb5(AsO4)3Cl Plumbogummite: PbAl3(PO4)2(OH)5·(H2O)
Comments: White, fuzzy aggregates of plumbogummite covering lime green mimetite (campylite) crystals. Location: Caldbeck Fells, Cumbria, England. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Mitridatite: Ca2Fe+++3(PO4)3O2·3(H2O)
Comments: Dark brown crystals of mitridatite on whitlockite. Location: Tip Top mine, Custer, Custer County, South Dakota, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Molybdofornacite: Pb2Cu[(As,P)O4][(Mo,Cr)O4](OH)
Comments: Lime green, tabular crystals of molybdofornacite on matrix. Location: Mahoney district, Tres Hermanas Mountains, Luna County, New Mexico, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Monazite-(Ce): (Ce,La,Nd,Th)PO4
Comments: Orange crystals of monazite-(Ce) on lepidolite. Location: Conselheiro Pena, Minas Gerais, Brazil. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Montebrasite: LiAl(PO4)(OH,F)
Comments: Transparent, pale yellow, tabular crystals of Montebrasite on matrix. Location: Newry, Oxford County, Maine, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Montgomeryite: Ca4MgAl4(PO4)6(OH)4·12(H2O) Tiptopite: K2(Na,Ca)2Li3Be6(PO4)6(OH)2·(H2O)
Comments: Clear, acicular crystals of tiptopite with red montgomeryite. Location: Tip Top mine, Custer, Custer County, South Dakota, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
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
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
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
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
Mounanaite: PbFe+++2(VO4)2(OH)2
Comments: Yellow crystal of mounanaite on matrix. Location: Mounana, Haut-Ogoue, Gabon. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Nacrite: Al2Si2O5(OH)4
Comments: Colorless, transparent crystal of macrite on matrix. Location: Hunersedge mine, Baden-Wurttemburg, Germany. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Narsarsukite: Na2(Ti,Fe+++)Si4(O,F)11
Comments: Narsarsukite crystal in matrix. Location: Mont Saint-Hilaire, Quebec, Canada. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals