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Medvedevite, KMn2+V5+2O6Cl⋅2H2O, a new fumarolic mineral from the Tolbachik fissure eruption 2012–2013, Kamchatka Peninsula, Russia

Published online by Cambridge University Press:  13 May 2022

Andrey P. Shablinskii
Affiliation:
Institute of Silicate Chemistry of the Russian Academy of Sciences, Makarova Emb. 2., 199034, Saint Petersburg, Russia
Margarita S. Avdontceva
Affiliation:
Institute of Earth Sciences, Saint Petersburg State University, University Emb. 7/9., 199034, Saint Petersburg, Russia
Lidiya P. Vergasova
Affiliation:
Institute of Volcanology and Seismology, Far Eastern Branch of the Russian Academy of Sciences, Piip Boulevard 9, 683006, Petropavlovsk-Kamchatsky, Russia
Stanislav K. Filatov*
Affiliation:
Institute of Earth Sciences, Saint Petersburg State University, University Emb. 7/9., 199034, Saint Petersburg, Russia
Evgenia Yu. Avdontseva
Affiliation:
Institute of Earth Sciences, Saint Petersburg State University, University Emb. 7/9., 199034, Saint Petersburg, Russia
Alexey V. Povolotskiy
Affiliation:
Institute of Chemistry, Saint Petersburg State University, University Emb. 7/9., 199034, Saint Petersburg, Russia
Svetlana V. Moskaleva
Affiliation:
Institute of Volcanology and Seismology, Far Eastern Branch of the Russian Academy of Sciences, Piip Boulevard 9, 683006, Petropavlovsk-Kamchatsky, Russia
Anatoly A. Kargopoltsev
Affiliation:
Institute of Volcanology and Seismology, Far Eastern Branch of the Russian Academy of Sciences, Piip Boulevard 9, 683006, Petropavlovsk-Kamchatsky, Russia
Sergey N. Britvin
Affiliation:
Institute of Earth Sciences, Saint Petersburg State University, University Emb. 7/9., 199034, Saint Petersburg, Russia
Olga U. Shorets
Affiliation:
Institute of Silicate Chemistry of the Russian Academy of Sciences, Makarova Emb. 2., 199034, Saint Petersburg, Russia
*
*Author for correspondence: Stanislav K. Filatov, Email: filatov.stanislav@gmail.com

Abstract

Medvedevite, KMn2+V5+2O6Cl⋅2H2O, is a new mineral discovered in the Toludskoe lava field, formed during the 2012–2013 Tolbachik fissure eruption. The mineral occurs as thin acicular transparent bright red crystals up to 0.15 mm. Medvedevite is associated with thénardite, halite, aphthitalite, leonite, kieserite, eugsterite and syngenite. The empirical formula calculated on the basis of 13+ positive charge units for the anhydrous part and 2H2O is (K1.02Na0.03)Σ1.05Mn2+0.95(V5+1.92S6+0.05Si0.04)Σ2.01O6.02Cl0.96⋅2H2O. The crystal structure of medvedevite was determined using single-crystal X-ray diffraction data: monoclinic crystal system, the space group is P21/c, a = 7.1863(2), b = 10.1147(3), c = 12.7252(4) Å, β = 106.243(3)°, V = 888.04(5) Å3, Z = 4 and R1 = 0.029. The concept of ‘structural unit’ and ‘interstitial complex’ could be applied to the crystal structure of medvedevite. The structural units in medvedevite are based on the high bond-valence V5+O5 polyhedra which share edges and link into [V2O6] chains elongated along the a axis. The interstitial complexes consist of Mn2+, K+ cations and H2O groups and occupy the interstices between structural units. The mineral is optically biaxial (+), with α =1.782(2), β = 1.786(2), γ = 1.792(2), 2V(calc) = 41° (λ = 589 nm). The seven strongest lines of the powder XRD pattern are [d, Å (I, %) (hkl)]: 7.79(100)(011); 5.70(11)(110); 4.75(14)(11$\bar{2}$); 3.89(29)(022); 3.25(53)(031); 2.958(79)(21$\bar{3}$); and 2.850(33)(220). The mineral has been named in honour of the Russian geologist and chemist Robert Alexandrovich Medvedev (1939–2005).

Type
Article
Copyright
Copyright © The Author(s), 2022. Published by Cambridge University Press on behalf of The Mineralogical Society of Great Britain and Ireland

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Footnotes

Associate Editor: G. Diego Gatta

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Medvedevite, KMn2+V5+2O6Cl⋅2H2O, a new fumarolic mineral from the Tolbachik fissure eruption 2012–2013, Kamchatka Peninsula, Russia
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