European Journal of Mineralogy
European Journal of Mineralogy
European Journal of Mineralogy
Articles | Volume 37, issue 5
Articles | Volume 37, issue 5
https://doi.org/10.5194/ejm-37-783-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/ejm-37-783-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 37, issue 5
New minerals, nomenclature, and classification
 | 
21 Oct 2025
New minerals, nomenclature, and classification |  | 21 Oct 2025

Jonlarsenite, Al4Cu9, a new intermetallic phase in the Al–Cu system discovered in a micrometeorite from Oslo, Norway

Luca Bindi, Jan B. Kihle, Guangming Cheng, Jinping Hu, Nan Yao, Chi Ma, Yunbin Guan, Paul D. Asimow, and Paul J. Steinhardt

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Short summary
During project STARDUST, over 5500 specimens were recovered. Among them, a micrometeorite from Oslo (NMM/L2) revealed a new Al–Cu alloy with Al₄Cu₉ stoichiometry. This phase was approved as a new mineral named jonlarsenite. The microspherule shows features typical of micrometeorites. Its extraterrestrial origin is confirmed by oxygen isotope composition and chondritic chemistry, similar to previously known Al–Cu meteoritic materials.
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