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Belomarinaite KNa(SO4): A new sulfate from 2012–2013 Tolbachik Fissure eruption, Kamchatka Peninsula, Russia

Published online by Cambridge University Press:  21 January 2019

Stanislav K. Filatov Open the ORCID record for Stanislav K. Filatov [Opens in a new window] ,
Andrey P. Shablinskii ,
Lidiya P. Vergasova ,
Olga U. Saprikina ,
Rimma S. Bubnova ,
Svetlana V. Moskaleva  and
Alexander B. Belousov
Stanislav K. Filatov*
Affiliation:
Institute of Earth Sciences, Saint Petersburg State University, University Emb. 7/9., 199034, Saint- Petersburg, Russia
Andrey P. Shablinskii
Affiliation:
Institute of Earth Sciences, Saint Petersburg State University, University Emb. 7/9., 199034, Saint- Petersburg, Russia Institute of Silicate Chemistry of the Russian Academy of Sciences, Makarova Emb. 2., 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, Russian Academy of Sciences, Petropavlovsk-Kamchatsky, Russia
Olga U. Saprikina
Affiliation:
Institute of Earth Sciences, Saint Petersburg State University, University Emb. 7/9., 199034, Saint- Petersburg, Russia Institute of Silicate Chemistry of the Russian Academy of Sciences, Makarova Emb. 2., 199034, Saint- Petersburg, Russia
Rimma S. Bubnova
Affiliation:
Institute of Earth Sciences, Saint Petersburg State University, University Emb. 7/9., 199034, Saint- Petersburg, Russia Institute of Silicate Chemistry of the Russian Academy of Sciences, Makarova Emb. 2., 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, Russian Academy of Sciences, Petropavlovsk-Kamchatsky, Russia
Alexander B. Belousov
Affiliation:
Institute of Volcanology and Seismology, Far Eastern Branch of the Russian Academy of Sciences, Piip Boulevard 9, 683006, Russian Academy of Sciences, Petropavlovsk-Kamchatsky, Russia
*
*Author for correspondence: Stanislav K. Filatov, Email: [email protected]
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Abstract

Belomarinaite, ideally KNaSO4, is a new sulfate mineral discovered in the Toludskoe lava field, formed during the 2012–2013 Tolbachik Fissure eruption. The mineral occurs as arborescent aggregates of tabular crystals (1 mm × 0.3 mm × 0.1 mm) comprising hematite impurities. The average size of the aggregates is 0.5–0.7 mm. The empirical formula is (K0.95Na0.92Cu0.04)Σ1.91S1.01O4. The crystal structure of belomarinaite was determined using single-crystal X-ray diffraction data; the space group is P3m1, a = 5.6072(3), c = 7.1781(4) Å, V = 195.45(2) Å3, Z = 2 and R1 = 2.6%. In the crystal structure of belomarinaite, there are six cation sites: the [4]S1 and [4]S2 sites are occupied by S, the [6]Na and [12]K sites are occupied by Na and K, respectively, giving Na0.5K0.5 apfu and the [10]M1 and [10]M2 sites are occupied by Na0.78K0.22 and K0.78Na0.22 apfu, respectively. The crystal structure is a framework of SO4 tetrahedra, Na octahedra and K, M1 and M2 polyhedra. Belomarinaite is isostructural with the synthetic compound KNaSO4. In belomarinaite, Na and K are disordered over M1 and M2 sites; in its synthetic analogue, Na and K are ordered over M1 and M2 sites, respectively. The Mohs’ hardness is 2–3. The mineral is uniaxial (+), with ω = 1.485(3) and ε = 1.488(3) (λ = 589 nm). The strongest lines of the powder X-ray diffraction pattern [d, Å (I, %) (hkl)] are: 4.022(31)(101); 3.591(26)(002); 2.884(74)(102); 2.800(100)(110); 2.391(16)(003); 2.296(8)201; 2.008(38)(022); and 1.634(10)(212). The mineral was named in honour of Russian volcanologist Marina Gennadievna Belousova (b. 1960) for her significant contributions to the monitoring of the Tolbachik Fissure eruption.

Keywords

new mineralbelomarinaitesulfatecrystal structurefumarole mineralsKamchatka peninsula
Type
Article
Information
Mineralogical Magazine , Volume 83 , Issue 4 , August 2019 , pp. 569 - 575
Copyright
Copyright © Mineralogical Society of Great Britain and Ireland 2019 

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Footnotes

Associate Editor: David Hibbs

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