European Journal of Mineralogy
European Journal of Mineralogy
European Journal of Mineralogy
Articles | Volume 38, issue 3
Articles | Volume 38, issue 3
https://doi.org/10.5194/ejm-38-325-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/ejm-38-325-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 38, issue 3
New minerals, nomenclature, and classification
 | 
11 Jun 2026
New minerals, nomenclature, and classification |  | 11 Jun 2026

Argentotennantite-(Fe), Ag6(Cu4Fe2)As4S13, a new member of the tetrahedrite group from the San Genaro mine, Peru: occurrence and crystal structure

Jiří Sejkora, Dalibor Velebil, Cristian Biagioni, Zdeněk Dolníček, and Jaroslav Hyršl

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Short summary
Argentotennantite-(Fe), ideally Ag6(Cu4Fe2)As4S13, is a new member of the tetrahedrite group found in the San Genaro mine, Castrovirreyna Province, Huancavelica, Peru. It occurs as anhedral grains up to 100 μm in size, or, more commonly, it forms micrometer-sized rims around crystals of argentotetrahedrite-(Zn) or replaces the latter around cavities and fissures, along with Ag-rich tennantite-(Fe). It is cubic, I3m, with a = 10.4365(5) Å, V = 1136.75(17) Å3.
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