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Belomarinaite KNa(SO (sub 4) ); a new sulfate from 2012-2013 Tolbachik fissure eruption, Kamchatka Peninsula, Russia

Stanislav K. Filatov, Andrey P. Shablinskii, Lidiya P. Vergasova, Olga U. Saprikina, Rimma S. Bubnova, Svetlana V. Moskaleva and Alexander B. Belousov
Belomarinaite KNa(SO (sub 4) ); a new sulfate from 2012-2013 Tolbachik fissure eruption, Kamchatka Peninsula, Russia
Mineralogical Magazine (August 2019) 83 (4): 569-575

Abstract

Belomarinaite, ideally KNaSO (sub 4) , 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 mmX0.3 mmX0.1 mm) comprising hematite impurities. The average size of the aggregates is 0.5-0.7 mm. The empirical formula is (K (sub 0.95) Na (sub 0.92) Cu (sub 0.04) ) (sub Sigma 1.91) S (sub 1.01) O (sub 4) . 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) Aa, V=195.45(2) Aa (super 3) , Z=2 and R (sub 1) =2.6%. In the crystal structure of belomarinaite, there are six cation sites: the (super [4]) S1 and (super [4]) S2 sites are occupied by S, the (super [6]) Na and (super [12]) K sites are occupied by Na and K, respectively, giving Na (sub 0.5) K (sub 0.5) apfu and the (super [10]) M1 and (super [10]) M2 sites are occupied by Na (sub 0.78) K (sub 0.22) and K (sub 0.78) Na (sub 0.22) apfu, respectively. The crystal structure is a framework of SO (sub 4) tetrahedra, Na octahedra and K, M1 and M2 polyhedra. Belomarinaite is isostructural with the synthetic compound KNaSO (sub 4) . 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 omega =1.485(3) and epsilon =1.488(3) (lambda =589 nm). The strongest lines of the powder X-ray diffraction pattern [d, Aa (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.


ISSN: 0026-461X
EISSN: 1471-8022
Serial Title: Mineralogical Magazine
Serial Volume: 83
Serial Issue: 4
Title: Belomarinaite KNa(SO (sub 4) ); a new sulfate from 2012-2013 Tolbachik fissure eruption, Kamchatka Peninsula, Russia
Affiliation: Saint Petersburg State University, Institute of Earth Sciences, Saint Petersburg, Russian Federation
Pages: 569-575
Published: 201908
Text Language: English
Publisher: Mineralogical Society, London, United Kingdom
References: 22
Accession Number: 2020-006671
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 6 tables, sketch map
N55°49'02" - N55°49'02", E160°22'02" - E160°22'02"
Secondary Affiliation: Russian Academy of Sciences, Institute of Silicate Chemistry, RUS, Russian FederationRussian Academy of Sciences, Institute of Volcanology and Seismology, RUS, Russian Federation
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 202006
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