European Journal of Mineralogy
European Journal of Mineralogy
European Journal of Mineralogy
Articles | Volume 37, issue 6
Articles | Volume 37, issue 6
https://doi.org/10.5194/ejm-37-829-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/ejm-37-829-2025
© 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
 | 
03 Nov 2025
New minerals, nomenclature, and classification |  | 03 Nov 2025

Kayupovaite, Na2Mn10[(Si14Al2)O38(OH)8] ⋅ 7H2O – a new stilpnomelane-related mineral from the Ushkatyn-III deposit, Kazakhstan

Oleg S. Vereshchagin, Sergey N. Britvin, Aleksey I. Brusnitsyn, Anastasiia K. Shagova, Elena N. Perova, Igor V. Pekov, Vladimir V. Shilovskikh, Natalia S. Vlasenko, Evgeniya Y. Avdontseva, Natalia V. Platonova, and Vladimir N. Bocharov

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Short summary
Kayupovaite is a new mineral named in honor of Maria Mikhailovna Kayupova (1921–1980), the mineralogist who studied the Ushkatyn-III deposit (Kazakhstan), the type of locality of the described mineral. Kayupovaite is monoclinic and of space group C2/c. The mineral belongs to the group of modulated manganese phyllosilicates and is structurally related to stilpnomelane. The absence of iron in the mineral is a result of oxidative Mn–Fe fractionation during the formation of braunite-rich Mn ores.
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