page_title: Metatorbernite
section_title: References
hierarchical_section_title: Metatorbernite / References
caption_attribution_description: English: Metatorbernite Locality: Margabal Mine, Entraygues-sur-Truyère, Aveyron, Midi-Pyrénées, France) Size: 4 x 3x 1.8 cm. Deutsch: Metatorbernit Fundort: Margabal Mine, Entraygues-sur-Truyère, Aveyron, Midi-Pyrénées, Frankreich ) Größe: 4 x 3x 1.8 cm. Français&#160;: Metatorbernite Localité:Mine de Margabal, Entraygues-sur-Truyère, Aveyron, Midi-Pyrénées, France. Taille :4 x 3x 1.8 cm
context_page_description: Metatorbernite is a radioactive phosphate mineral, and is a dehydration pseudomorph of torbernite. Chemically, it is a copper uranyl phosphate and usually occurs in the form of green platy deposits. It can form by direct deposition from a supersaturated solution, which produces true crystalline metatorbernite, with a dark green colour, translucent diaphaneity, and vitreous lustre. However, more commonly, it is formed by the dehydration of torbernite, which causes internal stress and breakage within the crystal lattice, resulting in crystals composed of microscopic powder held together using electrostatic force, and having a lighter green colour, opaque diaphaneity, and a relatively dull lustre. As with torbernite, it is named after the Swedish chemist Tornbern Bergmann. It is especially closely associated with torbernite, but is also found amongside autunite, meta-autunite and uraninite.
context_section_description: Mineralienatlas
  MinDat
  Webmineral
  Uranium minerals
caption: Metatorbernite from the Margabal Mine, Entraygues-sur-Truyère, France. Size: 4 x 3 x 1.8 cm.
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