A Thermal Study of the New Mineral Belomarinaite KNaSO4

M. G. Belousova, O. Yu Saprykina, R. S. Bubnova, A. P. Shablinskii, L. P. Vergasova, A. B. Belousov, S. K. Filatov

Research output: Contribution to journalArticlepeer-review

Abstract

Abstract: For the first time, the thermal behavior of a new mineral belomarinaite KNaSO4 from volcanic exhalations (trigonal crystal system, Sp. gr. P3m1, a = 5.6072(3), c = 7.1781(4) Å, V = 195.45(2) Å3) was studied on a natural sublimate sample from the 2012–2013 Tolbachik Fissure Eruption and its synthetic analogue, a low temperature (LT) polymorph of (Sp. gr. P3m1) in the range 30–800°C (high-temperature X‑ray diffraction) and 30–1000°C (DSC and TG). The mineral is stable up to a temperature of 470 ± 5°C, at which it has a polymorphic transformation into a high-temperature (HT) hexagonal polymorphic modification (Sp. gr. P63/mmc), which is stable until melted at 840°C based on DSC. The thermal expansion of both modifications is sharply anisotropic, and in the case of the HT phase the parameter a has a U-shape dependence with a minimum at T = 620°C. The volumetric expansion of the αV HT phase is greater than that for the LT phase by factors of 2–2.5 on average.

Translated title of the contributionТермическое исследование нового минерала беломаринаита KNaSO4
Original languageEnglish
Pages (from-to)51-57
Number of pages7
JournalВУЛКАНОЛОГИЯ И СЕЙСМОЛОГИЯ
Volume15
Issue number1
DOIs
StatePublished - Jan 2021

Scopus subject areas

  • Geophysics
  • Geology
  • Geochemistry and Petrology

Keywords

  • 2012‒2013 eruption
  • belomarinaite
  • high-temperature anhydrous sulfate
  • new mineral
  • thermal expansion
  • Tolbachik volcano
  • volcanic exhalations

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