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

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

doi:10.5194/ejm-37-937-2025

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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Latest update: 16 Dec 2025

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.