Mineral Specimen Images (M)

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

Metavauxite: Fe++Al2(PO4)2(OH)2·8(H2O)

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

Meurigite-K: [K(H2O)2.5][Fe+++8(PO4)6(OH)7(H2O)4]

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

Meurigite-K: [K(H2O)2.5][Fe+++8(PO4)6(OH)7(H2O)4]

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

Meurigite-Na: [Na(H2O)2.5][Fe+++8(PO4)6(OH)7(H2O)4]

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

Meurigite-Na: [Na(H2O)2.5][Fe+++8(PO4)6(OH)7(H2O)4]

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