page_title: Marthozite
hierarchical_section_title: Marthozite
caption_attribution_description: English: Marthozite Locality: Musonoi Mine, Kolwezi, Western area, Katanga Copper Crescent, Katanga (Shaba), Democratic Republic of Congo (Zaïre) (Locality at mindat.org) Size: small cabinet, 6.2 x 5.3 x 4.0 cm Marthozite Superb, unusually large marthozite crystals to 4.5 mm (twinned?) in a protective vug! Deutsch: Marthozit Fundort: Musonoi Mine, Kolwezi, Western area, Katanga Copper Crescent, Katanga, Demokratische Republik Kongo (Fundort bei mindat.org) Größe: 6.2 x 5.3 x 4.0 cm
context_page_description: Marthozite is an orthorhombic mineral that has a general formula of Cu(UO₂)₃(SeO₃)₃(OH)₂·7H₂O. It was named after Belgian mineralogist Aimé Marthoz, former Director-general of the Union Minière du Haut Katanga - UMHK.
  It is usually found in cavities in selenian digenite. It is specifically found in the zones of oxidation of the Musonoi deposit in Katanga, Africa.
  Marthozite is orthorhombic, meaning that it has three axes of unequal lengths all orthogonal to each other. Since it is orthorhombic, marthozite is biaxial, meaning that it has three different indices of refraction. Marthozite is anisotropic, which means that it breaks light into one fast ray and one slow ray. Marthozite shows pleochroism from yellowish brown to greenish yellow.
context_section_description: Marthozite is an orthorhombic mineral that has a general formula of Cu(UO₂)₃(SeO₃)₃(OH)₂·7H₂O.  It was named after Belgian mineralogist Aimé Marthoz (1894-1962), former Director-general of the Union Minière du Haut Katanga - UMHK.
  It is usually found in cavities in selenian (selenium-containing) digenite.  It is specifically found in the zones of oxidation of the Musonoi deposit in Katanga, Africa. 
  Marthozite is orthorhombic, meaning that it has three axes of unequal lengths all orthogonal to each other. Since it is orthorhombic, marthozite is biaxial, meaning that it has three different indices of refraction.  Marthozite is anisotropic, which means that it breaks light into one fast ray and one slow ray. Marthozite shows pleochroism from yellowish brown to greenish yellow.
caption: Marthozite crystals in a vug, from Katanga (size: 6.2 x 5.3 x 4.0 cm)
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