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Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria

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Bulgarian Academy of Sciences, Institute of Physical Chemistry, Bulgaria

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Institute of Isotope Geochemistry and Mineral Resources, ETH Zurich, Switzerland

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Bulgarian Academy of Sciences, Geological Institute, Bulgaria

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Bulgarian Academy of Sciences, Central laboratory of Mineralogy and Crystallography, Bulgaria

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Sofia University, Department of Mineralogy, Petrology, Ores and Minerals, Bulgaria

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Department of Mineralogy, Faculty of Geology and Geophysics, University of Bucharest, 010041, Bucharest, Romania

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