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

Viewed

Total article views: 75 (including HTML, PDF, and XML)
HTML PDF XML Total Supplement BibTeX EndNote
56 17 2 75 6 0 0
  • HTML: 56
  • PDF: 17
  • XML: 2
  • Total: 75
  • Supplement: 6
  • BibTeX: 0
  • EndNote: 0
Views and downloads (calculated since 06 Jan 2026)
Cumulative views and downloads (calculated since 06 Jan 2026)

Viewed (geographical distribution)

Total article views: 51 (including HTML, PDF, and XML) Thereof 51 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Latest update: 10 Jan 2026
Download
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.

Read more
Share
Special issue
New minerals, nomenclature, and classification: EJM support