European Journal of Mineralogy
European Journal of Mineralogy
European Journal of Mineralogy
Articles | Volume 38, issue 4
Articles | Volume 38, issue 4
https://doi.org/10.5194/ejm-38-531-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/ejm-38-531-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 38, issue 4
New minerals, nomenclature, and classification
 | 
19 Aug 2026
New minerals, nomenclature, and classification |  | 19 Aug 2026

Belmonteite, CaMn2(AsO4)2(H2O)5 ⋅ 2H2O, a new arsenate mineral from the Mn ore deposits of the Graveglia Valley, eastern Liguria, Italy

Cristian Biagioni, Jiří Sejkora, and Zdeněk Dolníček

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Short summary
Belmonteite, CaMn2(AsO4)2(H2O)5·2H2O, is a new mineral discovered in the Mn ore deposits of eastern Liguria (Italy). Its crystal structure shows {010} layers of six-fold-coordinated Mn atoms decorated on both sides by (AsO4) groups and Ca atoms and connected through H bonds. The genesis of this mineral is related to the circulation of As-rich oxidizing fluids within the Mn ore deposits. The name honors Donato Belmonte for his contribution to the knowledge of the mineralogy of Liguria.
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