Mineral Specimen Images (M)

Metaschoderite: Al2(PO4)(VO4)·6(H2O)

Comments: Orange crystalline metaschoderite crust on shale.
Location: 25 miles east of Eureka, Fish Creek Range, Eureka County, Nevada, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Metaschoepite: UO3·n(H2O)(n<2)  
Antlerite: Cu3(SO4)(OH)4

Comments: Yellow crystals of metaschoepite with green antlerite.
Location: Pöhla-Tellerhäuser Gallery, Pöhla, Schwarzenberg District, Erzgebirge, Saxony, Germany. Scale: Picture size 1.3 mm.
© Thomas Witzke / Abraxas-Verlag

Metasideronatrite: Na2Fe+++(SO4)2(OH)·(H2O)  
Tamarugite: NaAl(SO4)2·6(H2O)

Comments: Orange metasideronatrite with white tamarugite.
Location: Willi Agatz Mine, Dresden, Saxony, Germany. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Metasideronatrite: Na2Fe+++(SO4)2(OH)·(H2O)  
Ungemachite: K3Na8Fe+++(SO4)6(NO3)2·6(H2O)

Comments: Translucent rounded ungemachite microcrystal on yellow metasideronatrite.
Location: Chuquicamata, Antofagasta, Chile. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Metastibnite: Sb2S3  
Sulfur: S8

Comments: Red coatings of metastibnite with yellow sulfur.
Location: Steamboat Springs, Washoe County, Nevada, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Metastudtite: UO4·2(H2O)

Comments: White acicular microcrystal metastudtite clusters on dark yellow to brown sklodowskite grains.
Location: Musonoi, Katanga, Shaba, Zaire. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Metaswitzerite: Mn3(PO4)2·4(H2O)

Comments: Bladed crystalline sprays of milk chocolate-colored metaswitzerite crystals.
Location: Foote mine, Kings Mountain, Cleveland County, North Carolina, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Metatorbernite: Cu(UO2)2(PO4)2·8(H2O)

Comments: Green, square, tabular crystals of metatorbernite on matrix.
Location: Wheal Basset, Illogan, Cornwall, England, UK. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Metatorbernite: Cu(UO2)2(PO4)2·8(H2O)  
Schoepite: (UO2)8O2(OH)12·12(H2O)

Comments: Green, tabular crystals of metatorbernite and acicular, yellow schoepite on matrix.
Location: Musonoi mine, Kolwezi, Shaba, (Katanga), Congo (Zaïre). Scale: Picture size 2.5 mm.
© Paul M. Schumacher

Metatorbernite: Cu(UO2)2(PO4)2·8(H2O)  
Metatyuyamunite: Ca(UO2)2V2O8·3(H2O)

Comments: Yellow, platy metatyuyamunite and transparent, tabular green metatorbernite crystals with a minor amount of white, snowy-looking saleeite.
Location: Mashamba West Mine, Kolwezi, Shaba (Katanga), Congo (Zaïre). Scale: Picture size 0.5 cm.
© Paul M. Schumacher

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

Metatyuyamunite: Ca(UO2)2V2O8·3(H2O)  
Metatorbernite: Cu(UO2)2(PO4)2·8(H2O)

Comments: Yellow, platy metatyuyamunite and transparent, tabular green metatorbernite crystals with a minor amount of white, snowy-looking saleeite.
Location: Mashamba West Mine, Kolwezi, Shaba (Katanga), Congo (Zaïre). Scale: Picture size 0.5 cm.
© Paul M. Schumacher

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

Metauranocircite: Ba(UO2)2(PO4)2·6-8(H2O)  
Uranocircite: Ba(UO2)2(PO4)2·12(H2O)

Comments: Brilliant, fluorescent yellow green crystals of uranocircite altered to meta-uranocircite.
Location: Bergen, Vogtland, Saxony, Germany. Scale: 2.3 x 2.2 cm.
© John Veevaert

Metauranocircite: Ba(UO2)2(PO4)2·6-8(H2O)  
Uranocircite: Ba(UO2)2(PO4)2·12(H2O)

Comments: Crystal fragment of uranocircite fracturing due to dehydration to meta-uranocircite. The most common are 100 and 010 fractures, with 110 close behind. But notice the 210 and 410 fractures (breaks) as well.
Location: . Scale: Crystal size 2x3.5 cm.
© Paul M. Schumacher

Metauranocircite: Ba(UO2)2(PO4)2·6-8(H2O)

Comments: Lemon yellow platy meta-uranocircite crystals on matrix.
Location: Schneeberg, Saxony, Germany. Scale: Crystal size 2 mm.
© Tom Loomis / Dakota Matrix

Metauranopilite: (UO2)6(SO4)(OH)10·5(H2O)

Comments: Orange-brown aggregates of metauranopilite with yellow green johannite on matrix. Unless sealed in glass, all uranopilite specimens should be considered to have become metauranopilite within a few months of being exposed to ambient air.
Location: Apex Mine, Lander Co., Nevada, USA. Scale: See Image.
© Paul M. Schumacher

Metauranospinite: Ca(UO2)2(AsO4)2·8(H2O)  
Uranospinite: Ca(UO2)2(AsO4)2·10(H2O)

Comments: Translucent platy uranospinite (probably dehydrated to metauranospinite) microcrystals on matrix.
Location: Grube Buhlskopf, near Ellweiler, Rheinland-Pfalz, Germany. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Metavandendriesscheite: PbU7O22·n(H2O)(n<12)

Comments: Botryoidal crusts of orange metavandendriesscheite with red- to yellow-brown prismatic masyuite.
Location: Giftkiesstollen, Jachymov, Bohemia, Czech Republic. Scale: Not Given.
© Diederik Visser

Metavanmeersscheite: U++++++(UO2)3(PO4)2(OH)6·2(H2O)  
Vanmeersscheite: U++++++(UO2)3(PO4)2(OH)6·4(H2O)

Comments: Yellow coatings of vanmeersscheite on sandstone. Unless sealed in glass, all specimens should be considered to have become metavanmeersscheite.
Location: Cameron, Coconino Co., Arizona, USA. Scale: Sample Size 4 cm Glass Vial.
© Diederik Visser