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metazeunerite
Metazeunerite is an arsenate mineral with a chemical formula of Cu(UO2)2(AsO4)2·8H2O. The origin of this mineral comes from the dehydration process that metazeunerite must go through, and its association with zeunerite. As dehydration occurs, zeunerite loses an electron and is then metamorphosed into metazeunerite.〔(Amethyst Galleries )〕 Its crystal system is tetragonal and its crystal class is 4/m, which is also called the tetragonal-dipyramidal class because it only has a vertical four-fold rotation axis that is perpendicular to the symmetry plane.〔Roberts,W., Campbell,T., and Rapp,G. (1990) Encyclopedia of Minerals (Second Edition), 558 p. Van Nordstrand Reinhold, New York.〕〔Klein, C., and Dutrow, B. (2007) The 23rd Edition of the Manual of Mineral Science (23rd edition), 194 p. John Wiley & Sons, Inc.〕 When looking at a thin section, metzeunerite is anisotropic, meaning that it has pleochroism. When a mineral is anisotropic, one can see whether it is unaixial or biaxial, depending on how fast the rays of light are moving through the mineral. This mineral is uniaxial negative due to the ordinary ray being slower than the extraordinary ray.〔("Optical Properties of Minerals." University of North Dakota )〕
Metazeunerite is an uncommon radioactive secondary mineral found in "arsenic bearing hydrothermal uranium deposits" across the world.〔("Metazeunerite." Mineral Data Publishing, 2005 )〕 This widespread mineral occurs specifically in Europe, western North America, Australia, Brazil and Chili, Namibia, and Kazakhstan.〔 It is currently studied through thermal decomposition by calculating the different levels of dehydration, as zeunerite is transformed into metazeunerite.〔(Frost, Ray L. "ScienceDirect - Thermochimica Acta : Thermal Decomposition of Metazeunerite—a High-resolution Thermogravimetric and Hot-stage Raman Spectroscopic Study." ScienceDirect - Home. Queensland University of Technology, 9 Apr. 2004. Web. 22 Nov. 2010 )〕
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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