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The new mineral novograblenovite, (NH (sub 4) ,K)MgCl (sub 3) .6H (sub 2) O from the Tolbachik Volcano, Kamchatka, Russia; mineral description and crystal structure

Viktor M. Okrugin, Sharapat S. Kudaeva, Oxana V. Karimova, Olga V. Yakubovich, Dmitry I. Belakovskiy, Nikita V. Chukanov, Andrey A. Zolotarev, Vladislav V. Gurzhiy, Nina G. Zinovieva, Andrey A. Shiryaev and Pavel M. Kartashov
The new mineral novograblenovite, (NH (sub 4) ,K)MgCl (sub 3) .6H (sub 2) O from the Tolbachik Volcano, Kamchatka, Russia; mineral description and crystal structure
Mineralogical Magazine (April 2019) 83 (2): 223-231

Abstract

The new mineral novograblenovite, (NH (sub 4) ,K)MgCl (sub 3) .6H (sub 2) O, 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 NH (sub 3) . 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) Aa, b=9.5176(3) Aa, c=13.2439(4) Aa, beta =90.187(2) degrees , V=1168.91(2) Aa (super 3) and Z=4. The five strongest reflections in the powder X-ray diffraction pattern [d (sub obs) , Aa (I, %) (hkl)] are: 3.330 (100) (220), 2.976 (45) (114), 2.353 (29) (224), 3.825 (26) (202), 1.997 (25) (422). The density calculated from the empirical formula and the X-ray data is 1.504 g cm (super -3) . The mineral is biaxial (+) with alpha =1.469(2), beta =1.479(2) and gamma =1.496(2) (lambda =589 nm); 2V (sub meas.) =80(10) degrees and 2V (sub calc.) =75.7 degrees . The crystal structure (solved and refined using single-crystal X-ray diffraction data, R (sub 1) =0.0423) is based on the perovskite-like network of (NH (sub 4) ,K)Cl (sub 6) -octahedra sharing chlorine vertices, and comprises [Mg(H (sub 2) O) (sub 6) ] (super 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 [(NH (sub 4) ) (sub 0.7) K (sub 0.3) ]MgCl (sub 3) .6H (sub 2) O. The mineral is named after Prokopiy Trifonovich Novograblenov, one of the researchers of Kamchatka Peninsula, a teacher, naturalist, geographer and geologist.


ISSN: 0026-461X
EISSN: 1471-8022
Coden: MNLMBB
Serial Title: Mineralogical Magazine
Serial Volume: 83
Serial Issue: 2
Title: The new mineral novograblenovite, (NH (sub 4) ,K)MgCl (sub 3) .6H (sub 2) O from the Tolbachik Volcano, Kamchatka, Russia; mineral description and crystal structure
Affiliation: Russian Academy of Sciences, Institute of Volcanology and Seismology, Russian Federation
Pages: 223-231
Published: 201904
Text Language: English
Publisher: Mineralogical Society, London, United Kingdom
References: 23
Accession Number: 2019-065532
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 8 tables
N55°49'02" - N55°49'02", E160°22'02" - E160°22'02"
Secondary Affiliation: Russian Academy of Sciences, Institute of Geology of Ore Deposits, Geochemistry, Mineralogy and Petrography, RUS, Russian FederationRussian Academy of Sciences, Fersman Mineralogical Museum, RUS, Russian FederationSaint Petersburg State University, RUS, Russian FederationMoscow State University, RUS, Russian Federation
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201934
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