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The new mineral novograblenovite, (NH4,K)MgCl3·6H2O from the Tolbachik volcano, Kamchatka, Russia: mineral description and crystal structure

Published online by Cambridge University Press:  24 May 2018

Viktor M. Okrugin
Affiliation:
Institute of Volcanology and Seismology FEB RAS, Piip Boulevard 9, Petropavlovsk-Kamchatsky, 683006, Russia
Sharapat S. Kudaeva
Affiliation:
Institute of Volcanology and Seismology FEB RAS, Piip Boulevard 9, Petropavlovsk-Kamchatsky, 683006, Russia
Oxana V. Karimova*
Affiliation:
Institute of Geology of Ore Deposits, Geochemistry, Mineralogy and Petrography (IGEM) RAS, Staromonetny 35, 119017 Moscow, Russia
Olga V. Yakubovich
Affiliation:
Institute of Geology of Ore Deposits, Geochemistry, Mineralogy and Petrography (IGEM) RAS, Staromonetny 35, 119017 Moscow, Russia Faculty of Geology, Moscow State University, Vorobievy Gory, 119899 Moscow, Russia
Dmitry I. Belakovskiy
Affiliation:
Fersman Mineralogical Museum RAS, Leninskiy Prospect, 18/2, 119071 Moscow, Russia
Nikita V. Chukanov
Affiliation:
Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432Russia
Andrey A. Zolotarev
Affiliation:
Institute of Earth Sciences, Saint-Petersburg State University, University Emb. 7/9, 199034 Saint-Petersburg, Russia
Vladislav V. Gurzhiy
Affiliation:
Institute of Earth Sciences, Saint-Petersburg State University, University Emb. 7/9, 199034 Saint-Petersburg, Russia
Nina G. Zinovieva
Affiliation:
Faculty of Geology, Moscow State University, Vorobievy Gory, 119899 Moscow, Russia
Andrey A. Shiryaev
Affiliation:
Institute of Geology of Ore Deposits, Geochemistry, Mineralogy and Petrography (IGEM) RAS, Staromonetny 35, 119017 Moscow, Russia Frumkin Institute of Physical Chemistry and Electrochemistry RAS, Leninsky prospect, 31, korp. 4, 119071 Moscow, Russia
Pavel M. Kartashov
Affiliation:
Institute of Geology of Ore Deposits, Geochemistry, Mineralogy and Petrography (IGEM) RAS, Staromonetny 35, 119017 Moscow, Russia
*
*Author for correspondence: Oxana V. Karimova, Email: [email protected]

Abstract

The new mineral novograblenovite, (NH4,K)MgCl3·6H2O, was found on basaltic lava from the 2012–2013 Tolbachik fissure eruption at the Plosky Tolbachik volcano, Kamchatka Peninsula, Russia. It occurs as prismatic, needle-like transparent crystals together with gypsum and halite. Novograblenovite was formed due to the exposure of the host rocks to eruptive gas exhalations enriched in HCl and NH3. Basalt was the source of potassium and magnesium for the mineral formation. Novograblenovite crystallises in the monoclinic space group C2/c, with unit-cell parameters a = 9.2734(3) Å, b = 9.5176(3) Å, c = 13.2439(4) Å, β = 90.187(2)°, V = 1168.91(2) Å3 and Z = 4. The five strongest reflections in the powder X-ray diffraction pattern [dobs, Å (I, %) (h k l)] are: 3.330 (100) (2 2 0), 2.976 (45) ($\bar{1}\; 1\; 4$), 2.353 (29) ($\bar {2}\; 2\; 4$), 3.825 (26) (2 0 2), 1.997 (25) ($\overline {4\; 2} $ 2). The density calculated from the empirical formula and the X-ray data is 1.504 g cm–3. The mineral is biaxial (+) with α = 1.469(2), β = 1.479(2) and γ = 1.496(2) (λ = 589 nm); 2Vmeas. = 80(10)° and 2Vcalc. = 75.7°. The crystal structure (solved and refined using single-crystal X-ray diffraction data, R1 = 0.0423) is based on the perovskite-like network of (NH4,K)Cl6-octahedra sharing chlorine vertices, and comprises [Mg(H2O)6]2+ groups in framework channels. The positions of all independent H atoms were obtained by difference-Fourier techniques and refined isotropically. All oxygen, nitrogen and chlorine atoms are involved in the system of hydrogen bonding, acting as donors or acceptors. The formula resulting from the structure refinement is [(NH4)0.7K0.3]MgCl3·6H2O. The mineral is named after Prokopiy Trifonovich Novograblenov, one of the researchers of Kamchatka Peninsula, a teacher, naturalist, geographer and geologist.

Type
Article
Copyright
Copyright © Mineralogical Society of Great Britain and Ireland 2018 

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Footnotes

Associate Editor: G. Diego Gatta

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