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marthozite
Marthozite is an orthorhombic mineral that has a general formula of Cu(UO2)3(SeO3)3(OH)2·7H2O.〔 It was named after French mineralogist Aime Marthoz, former Director-general of the Union Miniere du Haut Katanga.〔 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.〔Fleischer, M. (1970) New mineral names. American Mineralogist, 55, 533.〕 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.〔http://www.wolframalpha.com/entities/minerals/marthozite/u7/vh/op/ Accessed 16 September 2010〕 Marthozite shows pleochroism from yellowish brown to greenish yellow.〔 == References ==
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