Bulletin Mineralogie Petrologie

Velebil Dalibor, Sejkora Jiří, Dolníček Zdeněk

Volume 28, issue 1 (2020), pages 161-169

DOI: https://doi.org/10.46861/bmp.28.161

tetrahedrite, chemical composition, manganese, Cavnic, Botești, Săcărâmb, Romania

Eight samples of members of tetrahedrite group from Romanian deposits were examined in terms of their chemical composition studied by means of electron microprobe; five samples from Cavnic, two from Botești and one from Săcărâmb. Mean composition of all samples is corresponding to tetrahedrite-(Zn) and most of them contain Mn. The three Cavnic tetrahedrites contain up to 0.17 apfu, the two Botești samples contain up to 0.42 apfu and the Săcărâmb sample up to 0.83 apfu Mn. Pb and Sn were present at levels up to 0.01 apfu but entering of Pb and Sn into the crystal structure of tetrahedrite group minerals is questionable. Though the significant presence of Te is characteristic for the Botești and Săcărâmb deposits, the studied tetrahedrites from these deposits are virtually Te-free (only locally contents of Te up to 0.05 apfu were detected in one sample).

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