Abstract
A fragment of a polysulfide rock containing quartz and high density mineral inclusions has been investigated by using a 192Ir γ-ray dual computer tomograph. The tomographic image revealed the existence of three different mineral fractions, whose densities and effective atomic numbers, as calculated by means of the image histograms, were equal to 2.57 ± 0.24 × 103 kg/m3 (Z eff = 11.6 ± 2.1), 4.01 ± 0.22 × 103 kg/m3 (Z eff = 25.1 ± 2.1), and 6.01 ± 0.90 × 103 kg/m3 (Z eff = 68.5 ± 6.0), respectively. Subsequently, these minerals were identified as quartz, a complex mixture of medium density polymetallic sulfide (pyrite, blenda, chalcopyrite, and sphalerite), and galena as heavier component. A detailed mineralogical analysis confirmed these data.
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ACKNOWLEDGMENTS
We are grateful to Mihai Atanasiu M.S. for his help in describing the mineralogy of the investigated sample.