New arsenate minerals from the Arsenatnaya fumarole, Tolbachik volcano, Kamchatka, Russia. I. Yurmarinite, Na7(Fe3+,Mg,Cu)4(AsO4)6

Scientists have discovered yurmarinite, a new arsenate mineral with the formula Na7(Fe3+,Mg,Cu)4(AsO4)6, in sublimates from the Arsenatnaya fumarole at Tolbachik volcano, Kamchatka. This mineral forms as transparent, pale green to colorless crystals and exhibits unique structural features, including a 3D heteropolyhedral framework composed of M4O18 clusters linked with AsO4 tetrahedra. Yurmarinite is optically uniaxial and has a calculated density of 4.00 g/cm³. The discovery contributes to the understanding of arsenate minerals formed in volcanic exhalations and honors Professor Yuriy B. Marin, a renowned Russian mineralogist. The study employed electron microprobe analysis, X-ray diffraction, and Raman spectroscopy to characterize the mineral's properties.

Pekov, I. V., Zubkova, N. V., Yapaskurt, V. O., Belakovskiy, D. I., Lykova, I. S., Vigasina, M. F., Sidorov, E. G., & Pushcharovsky, D. Yu. (2014). New arsenate minerals from the Arsenatnaya fumarole, Tolbachik volcano, Kamchatka, Russia. I. Yurmarinite, Na₇(Fe³⁺,Mg,Cu)₄(AsO₄)₆. Mineralogical Magazine, 78(4), 905–917. https://doi.org/10.1180/minmag.2014.078.4.10