Pechblendas con alto contenido de circonio, de Guandacol, La Rioja (Argentina)
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In this short note, two high zirconium pitchblendes from La Rioja (Argentina) are studied. The pitchblende occurs in small very puré lenses and thin layers in sedimentary Carboniferous strata and it is characterized by an anomalous high content of Zr up to 5 % ZrOe. The zirconium is in acid-soluble state and was probable coprecipitated with the uranium as a hydrolysed compound. The associated sandstone contain only trace amounts of Zr. It is assumed that this uraniferous área is well characterized by this element. The paper includes the microscopical study, complete chemical analysis and the X-ray diffraction investigation of the best preserved sample, The density and structure of this pitchblende, on a "defect lattice hypothesis" of uranium cations is finally discussed.
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