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Metavanuralite: Al(UO2)2(VO4)2(OH)·8(H2O) Vanuralite: Al(UO2)2(VO4)2(OH)·11(H2O)
Comments: Bright yellow crystals of metavanuralite. Unless sealed in glass, all specimens of vanuralite change to metavanuralite. Location: Mounana mine (Mouana), Franceville, Haut-Ogooue, Gabon. Scale: See Image. © Paul M. Schumacher
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
Comments: Creamy colored prismatic metavauxite crystals to 3mm. Location: Siglo XX, Llallagua, Bolivia. Scale: Picture size 3 mm. © Tom Loomis / Dakota Matrix
Metavivianite: (Fe++3-x,Fe+++x)(PO4)2(OH)x·8-x(H2O), x=0.5
Comments: Rust-brown, metavivianite var. kertschenite crystals to 1.5 cm in length. Location: Kertsch Crimea, Ukraine. Scale: 5.5 x 3.5 cm. © John Veevaert
Metavoltine: K4Na4(Fe++,Zn)Fe+++6(SO4)12O2·20(H2O) Alunogen: Al2(SO4)3·17(H2O)
Comments: Yellow metavoltine with white alunogen. Location: Carola Mine, Freital, near Dresden, Saxony, Germany. Scale: Picture size 5 mm. © Thomas Witzke / Abraxas-Verlag
Metazellerite: Ca(UO2)(CO3)2·3(H2O) Voglite: Ca2Cu(UO2)(CO3)4·6(H2O)
Comments: Pale yellow crystalline metazellerite in matrix, with green voglite. Location: White Canyon #1 Mine, Frey Point, San Juan County, Utah, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
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
Metazeunerite: Cu(UO2)2(AsO4)2·8(H2O) Trogerite: H2(UO2)2(AsO4)2·8(H2O)
Comments: Yellow crystals of trögerite with green metazeunerite. Location: Walpurgis Flats, Weißer Hirsch Mine, Neustädtel, Schneeberg District, Erzgebirge, Saxony, Germany. Scale: Picture size 5 mm. © Thomas Witzke / Abraxas-Verlag
Methane hydrate-I: 46(H2O)·2(S)·6(L)
Comments: Yellow to white outcropping of massive methane hydrate infested with 2 to 5 cm polychaete worms (Hesiocoeca sp), AKA "ice worms". Location: 540 meters deep in the Gulf of Mexico. Scale: Picture size 30 cm. © Charles Fisher / Penn State
Meurigite-K: [K(H2O)2.5][Fe+++8(PO4)6(OH)7(H2O)4]
Comments: Brown meuirite-K oolite showing the concentric-fibrous internal structure. Location: Rengersdorf, Görlitz, Oberlausitz, Saxony, Germany. Scale: Picture size 6 mm. © Thomas Witzke / Abraxas-Verlag
Comments: Yellow, radial acicular sprays of meurigite to about 0.75 mm. Location: Teskov quarry, near Prague, Bohemia, Czech Republic. Scale: Picture size 1.5 cm. © Tom Loomis / Dakota Matrix
Comments: Yellow-green spheroidal crystals of meurigite to 0.1mm, in a 5mm vug in black rockbridgeite(?) matrix. Location: Hagendorf Sud Pegmatite, Oberpfalz, Bavaria, Germany. Scale: Picture size 1.2 cm. © Tom Loomis / Dakota Matrix
Meurigite-Na: [Na(H2O)2.5][Fe+++8(PO4)6(OH)7(H2O)4]
Comments: B&W image of sprays of meurigite-Na with turquoise, intergrown kidwellite/lipscombite, and crandallite on goethite. (AmMin, v94:720). Location: Silver Coin mine, Valmy, Iron Point district, Humboldt County, Nevada, USA. Scale: Largest Spray = 1 mm. © American Mineralogist
Comments: SEM image of meurigite-Na crystals. (AmMin, v94:720). Location: Silver Coin mine, Valmy, Iron Point district, Humboldt County, Nevada, USA. Scale: See Image. © American Mineralogist
Comments: Pale pearly yellow platy Meurigite-Na crystals all over vuggy matrix. Location: Tom's Phosphate quarry, Kapunda, South Australia, Australia. Scale: Picture size 5 mm. © Tom Loomis / Dakota Matrix
Meyerhofferite: Ca2B6O6(OH)10·2(H2O)
Comments: Transparent, tabular crystals of meyerhofferite on matrix. Location: 20-Mule Team Canyon, Death Valley, Inyo County, California, USA. Scale: Crystal size 1.5 cm. © John Veevaert
Meymacite: WO3·2(H2O)
Comments: Orange-brownish to yellow massive Meymacite. Location: Meymac, Corrèze, Limousin, France. Scale: Picture size 4 mm. © Thomas Witzke / Abraxas-Verlag
Miargyrite: AgSbS2
Comments: Metallic miargyrite crystal on quartz. Location: Braunsdorf, Saxony, Germay. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Miargyrite: AgSbS2 Aramayoite: Ag3Sb2(Sb,Bi)S6
Comments: Aramayoite is present as large thin plates (blue iridescence) to 1mm in massive gray miargyrite matrix. Location: Julcani Silver mine, Huancavelica Dept., Peru. Scale: Picture size 5 mm. © Tom Loomis / Dakota Matrix