Where it forms, where it's found
- Geological setting
Åsgruvanite-(Ce) occurs in a magnetite–REE skarn, but its formation postdates the groundmass carbonate and skarn assemblage, and it is associated with late-stage calcite, dolomite, a dollaseite-like allanite group mineral, gadolinite-(Y/Nd), and a fluorocarbonate related to bastnäsite-(Ce), with variable F contents.
- Type locality
- Ås mine
- Getback ore field
- Norberg
- Västmanland County
- Sweden
60.0805°, 15.9398°
2recorded occurrences
Safety & handling
Physical
Optical
- Optical type
- Uniaxial (+)
- Pleochroism
- Weak
very weak, colourless to faint green
- Notes
with a refractive index above 1.8; the calculated average is 1.88. In reflected polarised light, åsgruvanite-(Ce) is the most reflective (∼10 %) REE mineral in polished sections compared to gadolinite-(Nd), the dollaseite-like allanite group mineral, etc.
Crystallography
- Space group
- P-3m1
- Cell parameters
- a = 10.5728(6) Å · c = 15.0899(11) Å
- Z
- 1
- Type-locality form
anhedral, occasionally elongated grains up to 400 µm
Crystal structure
Chemical composition
Synonyms
- Åsgruvaniet-(Ce)
- Åsgruvanitt-(Ce)
- IMA2025-004
In other languages
- German
- Åsgruvanit-(Ce) · IMA 2025-004
Classification
Strunz
10th ed.9.FB
- 9SilicatesClass
- 9.FTektosilicates without zeolitic H2ODivision
- 9.FBTektosilicates with additional anionsGroup
- 9.FBÅsgruvanite-(Ce)Species
Literature, links & citation
Citations
- 2025Bosi, F.; Hatert, F.; Pasero, M.; Mills, S. J. (2025) IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) – Newsletter 85. European Journal of Mineralogy, 37 (3). 337-342 doi:10.5194/ejm-37-337-2025DOI: 10.5194/ejm-37-337-2025
- 2025Taddei, A.; Holtstam, D.; Jonsson, E.; Förster, H.-J.; Andersson, S. S.; Appelt, O.; Bindi, L. (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. European Journal of Mineralogy, 37 (6). 937-951 doi:10.5194/ejm-37-937-2025DOI: 10.5194/ejm-37-937-2025
Cite this entry
@misc{mineral2026,
author = {Mineral Index editorial board},
title = {Åsgruvanite-(Ce) — Mineral Index},
year = {2026},
url = {https://mineralindex.org/minerals/asgruvanite-ce-472215},
note = {Accessed 2026-05-11}
}