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-38-27-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
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https://doi.org/10.5194/ejm-38-27-2026
© 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
 | 
09 Jan 2026
New minerals, nomenclature, and classification |  | 09 Jan 2026

Spaltiite, Tl2Cu2As2S5, one more new thallium sulfosalt mineral from Lengenbach quarry, Binn, Switzerland

Stefan Graeser, Dan Topa, Herta Silvia Effenberger, Emil Makovicky, Werner Hermann Paar, and George Dincă

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Short summary
Spaltiite, ideally Tl2Cu2As2S5 (Z = 4), is a new thallium sulfosalt mineral discovered at the renowned Lengenbach locality in the Binn Valley, Canton of Valais, Switzerland. Spaltiite is a distinctly layered structure, with alternation of polar As–Cu layers and two somewhat different types of thallium layers.
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Experimental mineralogy, petrology, and geochemistry