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Pb2(AsO2OH)Cl2, a new phase from the Lavrion ancient slags, Greece: occurrence and characterization

Published online by Cambridge University Press:  05 July 2018

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

Transparent prismatic crystals of Pb2(AsO2OH)Cl2 were collected in black metallurgical slag on the coast in the Punta Zeza area, 3 km south of the town of Lavrion, Greece. Analyses by energy-dispersive X-ray spectrometry (EDS) provided the following chemical composition: PbO 73.04, As2O3 15.97, Cl 11.42, O=Cl –2.58, total 97.85 wt.%. The empirical formula calculated on the basis of As = 1 is HxPb2.03(AsO3)1.00Cl1.995 (x = 0.96). The infrared spectrum of Pb2(AsO2OH)Cl2 has characteristic AsO33– bands at 707 and 594 cm–1, O–H stretching vibrations at 3310 and 2900 cm–1 and a band at 1107 cm–1 which is assigned to As–O–H bending vibrations. The structure, which is monoclinic P21/m, a = 6.4235(8), b = 5.5399(7), c = 9.321(1) Å, β = 90.767(2)°, V = 331.67(7) Å3, R1 = 0.035, is identical to that of synthetic Pb2(AsO2OH)Cl2 and contains two symmetrically unique Pb sites and one As site. The crystal structure is based on [Pb2AsO2OH]2+ double chains interconnected via weak Pb–Cl bonds to produce a three-dimensional framework which is closely related to that of Pb oxysalt minerals containing [O2Pb3]2+ chains of oxocentred [OPb4]6+ tetrahedra including mendipite, damaraite, rickturnerite and plumboselite.

Keywords

lead arseniteprotonated oxoanionscrystal structureLavrionancient slag
Type
Research Article
Information
Mineralogical Magazine , Volume 76 , Issue 3 , June 2012 , pp. 597 - 602
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2016

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