European Journal of Mineralogy
European Journal of Mineralogy
European Journal of Mineralogy
Articles | Volume 38, issue 1
Articles | Volume 38, issue 1
https://doi.org/10.5194/ejm-38-1-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Special issue:
https://doi.org/10.5194/ejm-38-1-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 38, issue 1
New minerals, nomenclature, and classification
 | 
06 Jan 2026
New minerals, nomenclature, and classification |  | 06 Jan 2026

Keutschite, Cu2AgAsS4, a new mineral with a stannite structure from the Uchucchacua polymetallic deposit, Lima Department, Peru

Dan Topa, Rie Takagi Fredrickson, Chris Stanley, and George Dincă

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Short summary

Keutschite, Cu2AgAsS4, is a new mineral from the Uchucchacua polymetallic deposit, Oyon District, Catajambo, Lima Department, Peru. The ideal formula, derived from the crystal structure, is Cu2AgAsS4. The name honours Frank Keutsch (Harvard University), a German chemist who first drew attention to the mineral during his study of the minerals of the alabandite zone of the Uchucchacua deposit.

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