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Itelmenite, Na2CuMg2(SO4)4, a new anhydrous sulfate mineral from the Tolbachik volcano

Published online by Cambridge University Press:  15 May 2018

Evgeny V. Nazarchuk ,
Oleg I. Siidra ,
Atali A. Agakhanov ,
Evgeniya A. Lukina ,
Evgeniya Y. Avdontseva  and
Gennady A. Karpov
Evgeny V. Nazarchuk
Affiliation:
Department of Crystallography, St. Petersburg State University, University Embankment 7/9, 199034 St. Petersburg, Russia
Oleg I. Siidra*
Affiliation:
Department of Crystallography, St. Petersburg State University, University Embankment 7/9, 199034 St. Petersburg, Russia Nanomaterials Research Center, Kola Science Center, Russian Academy of Sciences, Apatity, 184200, Murmansk Region, Russia
Atali A. Agakhanov
Affiliation:
Fersman Mineralogical Museum, Russian Academy of Science, Leninskii Prospect, Bldg. 18, 117071 Moscow, Russia
Evgeniya A. Lukina
Affiliation:
Department of Crystallography, St. Petersburg State University, University Embankment 7/9, 199034 St. Petersburg, Russia
Evgeniya Y. Avdontseva
Affiliation:
Department of Crystallography, St. Petersburg State University, University Embankment 7/9, 199034 St. Petersburg, Russia
Gennady A. Karpov
Affiliation:
Institute of Volcanology and Seismology, Russian Academy of Sciences, Bulvar Piypa 9, Petropavlovsk-Kamchatskiy 683006, Russia
*
*E-mail: [email protected]
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Abstract

Itelmenite, ideally Na2CuMg2(SO4)4, was found in a fumarole of the Naboko scoria cone of the Tolbachik volcano Fissure Eruption (2012–2013), Kamchatka Peninsula, Russia. Itelmenite occurs as irregularly shaped grains as well as microcrystalline masses associated with anhydrite, saranchinaite, hermannjahnite, euchlorine, thénardite, aphthitalite and hematite. Itelmenite is orthorhombic, Pbca, a = 9.568(2) Å, b = 8.790(2) Å, c = 28.715(8) Å, V = 2415.0(11) Å3 and Z = 4 (from single-crystal diffraction data). The nine strongest lines of the powder X-ray diffraction pattern are [d(I)(hkl)]: 7.9614(41)(102), 7.1803(32)(004), 5.9122(64)(112), 3.8455(87)(122), 3.6292(52)(214), 3.3931(62)(215), 3.0003(44)(027), 2.9388(100)(312) and 2.4975(56)(230). The chemical composition determined by the electron-microprobe analysis is (wt.%): Na2O 10.77, K2O 0.20, MgO 11.10, CuO 15.38, ZnO 5.61, SO3 56.42, total 99.48. The empirical formula based on O = 32 apfu is (Na3.93K0.05)Σ3.98Mg3.12(Cu2.19Zn0.78)Σ2.97S7.97O32. The simplified formula is Na2CuMg2(SO4)4 taking into account structural data. The crystal structure was solved by direct methods and refined to an agreement index R1 = 0.034 on the basis of 1855 independent observed reflections. The structure of itelmenite is based on a unique type of [A2+3(SO4)4]2– (A = Mg, Cu and Zn) heteropolyhedral framework with voids filled by Na+ cations.

Keywords

itelmenitenew mineralscoppersulfatesframework structuresTolbachik volcano
Type
Article
Information
Mineralogical Magazine , Volume 82 , Issue 6 , December 2018 , pp. 1233 - 1241
Copyright
Copyright © Mineralogical Society of Great Britain and Ireland 2019 

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Footnotes

Associate Editor: Stuart Mills

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