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The crystal structure of Pb5(As3+O3)Cl7 from the historic slags of Lavrion, Greece – a novel Pb(II) chloride arsenite

Published online by Cambridge University Press:  05 July 2018

O. I. Siidra ,
S. V. Krivovichev ,
N. V. Chukanov ,
I. V. Pekov ,
A. Magganas ,
A. Katerinopoulos  and
P. Voudouris
O. I. Siidra*
Affiliation:
Department of Crystallography, Geological Faculty, Saint-Petersburg State University, University emb. 7/9, St. Petersburg, 199034, Russia
S. V. Krivovichev
Affiliation:
Department of Crystallography, Geological Faculty, Saint-Petersburg State University, University emb. 7/9, St. Petersburg, 199034, Russia
N. V. Chukanov
Affiliation:
Institute of Problems of Chemical Physics, Chernogolovka, Moscow Region, 142432, Russia
I. V. Pekov
Affiliation:
Faculty of Geology, Moscow State University, Vorob'evy Gory, GSP-2, Moscow, 119992, Russia
A. Magganas
Affiliation:
Department of Mineralogy and Petrology, Faculty of Geology and Geo-environment, National and Kapodistrian University of Athens, Panepistimioupolis 15784 Athens, Greece
A. Katerinopoulos
Affiliation:
Department of Mineralogy and Petrology, Faculty of Geology and Geo-environment, National and Kapodistrian University of Athens, Panepistimioupolis 15784 Athens, Greece
P. Voudouris
Affiliation:
Department of Mineralogy and Petrology, Faculty of Geology and Geo-environment, National and Kapodistrian University of Athens, Panepistimioupolis 15784 Athens, Greece
*
*E-mail: siidra@mail.ru
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Abstract

The crystal structure of new lead chloride arsenite, Pb5(As3+O3)Cl7 [orthorhombic, Pbcn, a = 16.894(2), b = 10.913 (1), c = 16.760(2) Å, V = 3090.1(7) Å3], from the historic slags of Lavrion, Greece, has been solved by direct methods and refined to R1 = 0.069. The structure contains five symmetrically unique Pb, one As, eight Cl and three O sites. The As atom forms three nearly equal As—O bonds which result in the formation of an AsO3 trigonal pyramid with As at the apex. The Pbl. Pb2, Pb3 and Pb4 atoms are bonded to the AsO3 groups via Pb2+—O bonds to form complex [Pb4(AsO3)] chains parallel to the b axis. The Pb(5) atom is coordinated solely by Cl– anions. The resulting Pb(5)Cl7 polyhedra share common edges and corners to produce bent chains parallel to the c axis. A short compilation of structural features of known lead chloride arsenites is given.

Keywords

lead arsenitescrystal structureLavrionmineralization in historic slag
Type
CNMNC Newsletter 8
Information
Mineralogical Magazine , Volume 75 , Issue 2 , April 2011 , pp. 337 - 345
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2011

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Structure factor data

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