European Journal of Mineralogy
European Journal of Mineralogy
European Journal of Mineralogy
Articles | Volume 37, issue 6
Articles | Volume 37, issue 6
https://doi.org/10.5194/ejm-37-937-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/ejm-37-937-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 37, issue 6
New minerals, nomenclature, and classification
 | 
16 Dec 2025
New minerals, nomenclature, and classification |  | 16 Dec 2025

Exploring the unusual occurrence, chemistry, and structural topology of åsgruvanite-(Ce), Ce16Ca5Al(SiO4)6(AsO3)8(CO3)2Cl3(ClF3)(OH)2, a new rare earth element (REE) mineral from Västmanland, Sweden

Alice Taddei, Dan Holtstam, Erik Jonsson, Hans-Jürgen Förster, Stefan S. Andersson, Oona Appelt, and Luca Bindi

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Short summary
Åsgruvanite-(Ce) is a new rare Earth element (REE) mineral from Åsgruvan in Västmanland, Sweden, linked to Bastnäs-type mineralisation. The chemical formula ideally includes cerium, aluminium, silicon, arsenic, carbonate groups, chlorine, and fluorine. The mineral forms small, grey-green, lustrous grains with distinct cleavage and high density and is associated with carbonates and REE minerals like gadolinite and an allanite-like mineral. It has a unique layered crystal structure.
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