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The effect of As-Sb substitution in the Raman spectra of tetrahedrite-tennantite and pyrargyrite-proustite solid solutions

¹ Geology department, Faculty of Science, Zagazig University, Zagazig City, El-Sharkia, Egypt
² Institut für Mineralogie und Kristallographie, Universität Wien – Geozentrum, Althanstraße 14, 1090 Wien, Austria

^* Corresponding author, e-mail: eugen.libowitzky{at}univie.ac.at

Raman spectra of 17 fahlore samples (tetrahedrite-tennantite solid solution series) and 3 samples of the pyrargyrite-proustite solid solution series were recorded. The fundamental stretching and bending vibrations of the pyramidal (Sb, As)S₃ groups occur between 200 and 400 cm^–1. The position, shape, relative intensity and appearance of the bands vary depending upon the Sb/(Sb+As) ratios of both mineral series. The symmetric stretching mode (₁) shows a two-mode behavior in the tetrahedrite-tennantite solid solution series, whereas one-mode behavior is observed in all other cases. The excellent correlations between the positions of the vibrational modes and the Sb/(Sb+As) ratio, can be applied to determine the composition of the investigated sample by at least one band in the Raman spectrum of the mineral.

Key-words: tetrahedrite-tennantite solid solution, fahlore, pyrargyrite-proustite solid solution, Raman spectroscopy, pyramidal (As,Sb)S₃ group.