TY - JOUR

T1 - Crystal chemistry of alkali–aluminum–iron sulfates from the burnt mine dumps of the chelyabinsk coal basin, south urals, russia

AU - Zolotarev, Andrey A.

AU - Krivovichev, Sergey V.

AU - Avdontceva, Margarita S.

AU - Shilovskikh, Vladimir V.

AU - Rassomakhin, Mikhail A.

AU - Yapaskurt, Vasiliy O.

AU - Pekov, Igor V.

N1 - Funding Information: Funding: This research was funded by the Russian Foundation for Basic Research (electron probe microanalysis, single crystal X-ray diffraction; grant No. 19-05-00628) and by the President of Russian Federation grant for leading scientific schools (the theoretical crystal chemical analysis; grant No. NSh-2526.2020.5). Publisher Copyright: © 2020 by the authors. Licensee MDPI, Basel, Switzerland. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.

PY - 2020/11

Y1 - 2020/11

N2 - Technogenic steklite, KAl(SO4 )2, and unnamed mineral phase (K,Na)3 Na3 (Fe,Al)2 (SO4 )6 from burnt dumps of the Chelyabinsk Coal Basin have been investigated by single-crystal X-ray diffraction and electron microprobe analysis. Steklite is trigonal, space group P3, a = 4.7277(3), c = 7.9871(5) Å, V = 154.60(2) Å3 . The crystal structure was refined to R1 = 0.026 (wR2 = 0.068). It is based upon the [Al(SO4 )2 ]− layers formed by corner sharing of SO4 tetrahedra and AlO6 polyhedra. The anionic [Al(SO4 )2 ]− layers are parallel to the (001) plane and linked via interlayer K+ ions. The regular octahedral coordination of Al is observed that distinguishes technogenic steklite from that found in Tolbachik fumaroles. The (K,Na)3 Na3 (Fe,Al)2 (SO4 )6 phase is trigonal, space group R3, a = 13.932(2), c = 17.992(2) Å, V = 3024.4(7) Å3, R1 = 0.073 (wR2 = 0.108). The crystal structure is based upon the anionic chains [(Fe,Al)(SO4 )3 ]3− running parallel to the c axis and interconnected via K+ and Na+ ions. There are no known minerals or synthetic compounds isotypic to (K,Na)3 Na3 (Fe,Al)2 (SO4 )6, due to the presence of separate K and Na sites in its structure.

AB - Technogenic steklite, KAl(SO4 )2, and unnamed mineral phase (K,Na)3 Na3 (Fe,Al)2 (SO4 )6 from burnt dumps of the Chelyabinsk Coal Basin have been investigated by single-crystal X-ray diffraction and electron microprobe analysis. Steklite is trigonal, space group P3, a = 4.7277(3), c = 7.9871(5) Å, V = 154.60(2) Å3 . The crystal structure was refined to R1 = 0.026 (wR2 = 0.068). It is based upon the [Al(SO4 )2 ]− layers formed by corner sharing of SO4 tetrahedra and AlO6 polyhedra. The anionic [Al(SO4 )2 ]− layers are parallel to the (001) plane and linked via interlayer K+ ions. The regular octahedral coordination of Al is observed that distinguishes technogenic steklite from that found in Tolbachik fumaroles. The (K,Na)3 Na3 (Fe,Al)2 (SO4 )6 phase is trigonal, space group R3, a = 13.932(2), c = 17.992(2) Å, V = 3024.4(7) Å3, R1 = 0.073 (wR2 = 0.108). The crystal structure is based upon the anionic chains [(Fe,Al)(SO4 )3 ]3− running parallel to the c axis and interconnected via K+ and Na+ ions. There are no known minerals or synthetic compounds isotypic to (K,Na)3 Na3 (Fe,Al)2 (SO4 )6, due to the presence of separate K and Na sites in its structure.

KW - Alkali–aluminum–iron sulfate

KW - Anthropogenic (technogenic) mineralogy

KW - Burnt dump

KW - Chelyabinsk Coal Basin

KW - Steklite

UR - http://www.scopus.com/inward/record.url?scp=85096564024&partnerID=8YFLogxK

U2 - 10.3390/cryst10111062

DO - 10.3390/cryst10111062

M3 - Article

AN - SCOPUS:85096564024

VL - 10

SP - 1

EP - 12

JO - Liquid Crystals Today

JF - Liquid Crystals Today

SN - 1358-314X

IS - 11

M1 - 1062

ER -