European Journal of Mineralogy
European Journal of Mineralogy
European Journal of Mineralogy
Articles | Volume 37, issue 1
Articles | Volume 37, issue 1
https://doi.org/10.5194/ejm-37-39-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/ejm-37-39-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 37, issue 1
New minerals, nomenclature, and classification
 | 
20 Jan 2025
New minerals, nomenclature, and classification |  | 20 Jan 2025

Dacostaite, K(Mg2Al)[Mg(H2O)6]2(AsO4)2F6  ⋅  2H2O, a new fluoride–arsenate mineral from the Cetine di Cotorniano Mine (Tuscany, Italy)

Cristian Biagioni, Daniela Mauro, Jiří Sejkora, Zdeněk Dolníček, Andrea Dini, and Radek Škoda

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Latest update: 13 Aug 2026
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Short summary
Dacostaite is a new fluoride–arsenate mineral found in the Sb(Au) deposit of the Cetine di Cotorniano Mine (Tuscany, Italy). It shows a novel crystal structure formed by heteropolyhedral layers and isolated Mg(H2O)6 groups connected by H bonds. The heteropolyhedral layers are similar to those occurring in alunite-supergroup minerals, and this is a further example of the ability of nature to use similar modules in forming the large number of currently known structural arrangements. 
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