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Lorandite: TlAsS2
Comments: Gemmy, transparent reddish brown crystals of lorandite on matrix. Location: Allchar, near Majdan, Macedonia. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Lotharmeyerite: CaZnMn+++(AsO3OH)4(OH)3
Comments: Brown, prismatic crystals lotharmeyerite on matrix. Location: Ojuela mine, Mapimi, Durango, Mexico. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Mackayite: Fe+++Te2O5(OH)
Comments: Greenish brown crystals of mackayite on matrix. Location: McGuinnity shaft, Goldfield, Esmeralda County, Nevada, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Magnetite: Fe++Fe+++2O4
Comments: Black, opaque octahedral crystals of magnetite on matrix. Location: Isle of Ischia, near Naples, Compania, Italy. 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