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Itelmenite, Na (sub 2) CuMg (sub 2) (SO (sub 4) ) (sub 4) , a new anhydrous sulfate mineral from the Tolbachik Volcano

Evgeny V. Nazarchuk, Oleg I. Siidra, Atali A. Agakhanov, Evgeniya A. Lukina, Evgeniya Y. Avdontseva and Gennady A. Karpov
Itelmenite, Na (sub 2) CuMg (sub 2) (SO (sub 4) ) (sub 4) , a new anhydrous sulfate mineral from the Tolbachik Volcano
Mineralogical Magazine (December 2018) 82 (6): 1233-1241


Itelmenite, ideally Na (sub 2) CuMg (sub 2) (SO (sub 4) ) (sub 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, thenardite, aphthitalite and hematite. Itelmenite is orthorhombic, Pbca, a=9.568(2) Aa, b=8.790(2) Aa, c=28.715(8) Aa, V=2415.0(11) Aa (super 3) 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.%): Na (sub 2) O 10.77, K (sub 2) O 0.20, MgO 11.10, CuO 15.38, ZnO 5.61, SO (sub 3) 56.42, total 99.48. The empirical formula based on O=32 apfu is (Na (sub 3.93) K (sub 0.05) ) (sub Sigma 3.98) Mg (sub 3.12) (Cu (sub 2.19) Zn (sub 0.78) ) (sub Sigma 2.97) S (super 7.97) O (sub 32) . The simplified formula is Na (sub 2) CuMg (sub 2) (SO (sub 4) ) (sub 4) taking into account structural data. The crystal structure was solved by direct methods and refined to an agreement index R (sub 1) =0.034 on the basis of 1855 independent observed reflections. The structure of itelmenite is based on a unique type of [A (super 2+) (sub 3) (SO (sub 4) ) (sub 4) ] (super 2-) (A=Mg, Cu and Zn) heteropolyhedral framework with voids filled by Na (super +) cations.

ISSN: 0026-461X
EISSN: 1471-8022
Serial Title: Mineralogical Magazine
Serial Volume: 82
Serial Issue: 6
Title: Itelmenite, Na (sub 2) CuMg (sub 2) (SO (sub 4) ) (sub 4) , a new anhydrous sulfate mineral from the Tolbachik Volcano
Affiliation: St. Petersburg State University, Department of Crystallography, Saint Petersburg, Russian Federation
Pages: 1233-1241
Published: 201812
Text Language: English
Publisher: Mineralogical Society, London, United Kingdom
References: 13
Accession Number: 2019-024176
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 6 tables
N55°49'02" - N55°49'02", E160°22'02" - E160°22'02"
Secondary Affiliation: Russian Academy of Sciences, Nanomaterials Research Center, RUS, Russian FederationRussian Academy of Sciences, Fersman Mineralogical Museum, RUS, Russian FederationRussian Academy of Sciences, Institute of Volcanology and Seismology, 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: 2019
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