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Bystrite, Na7Ca(Al6Si6O24)S52–Cl–: formula redefinition and relationships with other four-layer cancrinite-group minerals

Published online by Cambridge University Press:  19 April 2023

Nikita V. Chukanov ,
Anatoly N. Sapozhnikov ,
Ekaterina V. Kaneva Open the ORCID record for Ekaterina V. Kaneva [Opens in a new window] ,
Dmitry A. Varlamov Open the ORCID record for Dmitry A. Varlamov [Opens in a new window]  and
Marina F. Vigasina
Nikita V. Chukanov*
Affiliation:
Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432 Russia Faculty of Geology, Moscow State University, Vorobievy Gory, Moscow, 119991 Russia
Anatoly N. Sapozhnikov
Affiliation:
Vinogradov Institute of Geochemistry, Siberian Branch of Russian Academy of Sciences, 1a Favorskii St., Irkutsk, 664033, Russia
Ekaterina V. Kaneva
Affiliation:
Vinogradov Institute of Geochemistry, Siberian Branch of Russian Academy of Sciences, 1a Favorskii St., Irkutsk, 664033, Russia
Dmitry A. Varlamov
Affiliation:
Korzhinskii Institute of Experimental Mineralogy, Russian Academy of Sciences, 142432 Chernogolovka, Russia
Marina F. Vigasina
Affiliation:
Faculty of Geology, Moscow State University, Vorobievy Gory, Moscow, 119991 Russia
*
Corresponding author: Nikita V. Chukanov; Email: chukanov@icp.ac.ru
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Abstract

Bystrite is redefined as a four-layer cancrinite-group mineral with the four-layer Losod-type framework and the end-member formula Na7Ca(Al6Si6O24)S52–Cl–. The mineral is known only at the Malo–Bystrinskoe gem lazurite deposit, Baikal Lake area, Siberia, Russia. The associated minerals are calcite, lazurite, sodalite, fluorapatite, phlogopite, diopside, dolomite and plagioclase. Bystrite is brittle, with the Mohs hardness of 5 and distinct cleavage on {10$\bar{1}$0}. The yellow colour of bystrite is due to the presence of S52– anions occurring in Losod (LOS) cages of the aluminosilicate framework with the ABAC stacking sequence. Measured and calculated density is, respectively, 2.43(1) and 2.412 g cm–3 for the holotype and 2.42(1) and 2.428 g cm–3 for the cotype sample. Bystrite is uniaxial (+), ɛ = 1.660(2) and ω = 1.584(2). The mineral was characterised by infrared and Raman spectra. The empirical formulae of the holotype and cotype samples are Na6.97K0.04Ca0.98(Si6.03Al5.97O24)(S52–)0.93[(SO42–)0.15Cl0.83] and Na6.75K0.04Ca1.11(Si6.09Al5.91O24)(S52–)1.04[(HS–)0.17Cl0.85], respectively. Bystrite is trigonal, space group P31c. The unit-cell parameters are: a = 12.8527(6) Å, c = 10.6907(5) Å, V = 1529.4(1) Å3 and Z = 2. The strongest lines of the powder X-ray diffraction pattern [d, Å (I, %) (hkl)] are: 4.821 (32) (102), 3.915 (38) (211), 3.712 (100) (300), 3.307 (50) (212), 2.782 (18) (400), 2.692 (22) (401), 2.673 (30) (004) and 2.468 (23) (402). Isomorphism and genesis of bystrite-type minerals is discussed. Bystrite and its K,HS-analogue sulfhydrylbystrite, Na5K2Ca(Al6Si6O24)S52–(HS)–, are indicators of highly reducing conditions.

Keywords

bystritecancrinite groupformula redefinitionIR spectroscopyRaman spectroscopyMalo–Bystrinskoe deposit
Type
Article
Information
Mineralogical Magazine , Volume 87 , Issue 3 , June 2023 , pp. 455 - 464
Copyright
Copyright © The Author(s), 2023. Published by Cambridge University Press on behalf of The Mineralogical Society of the United Kingdom and Ireland

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Footnotes

Associate Editor: Owen Missen

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