Articles | Volume 37, issue 5
https://doi.org/10.5194/ejm-37-627-2025
https://doi.org/10.5194/ejm-37-627-2025
Research article
 | 
15 Sep 2025
Research article |  | 15 Sep 2025

Vielleaureite-(Ce), a new epidote of the dollaseite group, coexisting with Mn-dominant hellandite in Mn deposits of the central Pyrenees

Alain Ragu, Luca Bindi, Paola Bonazzi, Laurent Remusat, and Christian Chopin

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Cited articles

Armbruster, T., Bonazzi, P., Akasaka, M., Bermanec V., Chopin, C., Gieré, R., Heuss-Assbichler, S., Liebscher, A., Menchetti, S., Pan, Y., and Pasero, M.: Recommended nomenclature of epidote-group minerals, Eur. J. Mineral., 18, 551–567, https://doi.org/10.1127/0935-1221/2006/0018-0551, 2006. 
Biagioni, C., Bonazzi, P., Pasero, M., Zaccarini, F., Balestra, C., Bracco, R., and Ciriotti, M. E.: Manganiakasakaite-(La) and ferriakasakaite-(Ce), two new epidote supergroup minerals from Piedmont, Italy, Minerals, 9, 353, https://doi.org/10.3390/min9060353, 2019. 
Bindi, L., Holtstam, D., Fantappié, G., Andersson, U. B., and Bonazzi, P.: Ferriperbøeite-(Ce), [CaCe3]Σ=4[Fe3+Al2Fe2+]Σ=4[Si2O7][SiO4]3O(OH)2, a new member of the polysomatic epidote–törnebohmite series from the Nya Bastnäs Fe-Cu-REE deposit Sweden, Eur. J. Mineral., 30, 537–544, https://doi.org/10.1127/ejm/2018/0030-2717, 2018. 
Bonazzi, P. and Menchetti, S.: Manganese in monoclinic members of the epidote group: Piemontite and related minerals, in: Epidotes, Rev. Mineral. Geochem., 56, 495–552, 2004. 
Bonazzi, P., Menchetti, S., and Reinecke, T.: Solid solution between piemontite and androsite-(La), a new mineral of the epidote group from Andros island, Greece, Am. Mineral., 81, 735–743, 1996. 
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Short summary
A new rare-earth-bearing silicate is described from a manganese ore deposit in the Pyrenees. It belongs to the epidote family and is characterised by the formula Mn2+Ce(MgAlMn2+)(Si2O7)(SiO4)F(OH).  This new mineral commonly contains inclusions of an Mn-rich yttrium borosilicate, a potentially new mineral of the hellandite family. This is a new type of occurrence for hellandite – while rare earths are under the spotlight.
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