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Crystal structure refinement of sahlinite Pb14(AsO4)2O9Cl4

Published online by Cambridge University Press:  05 July 2018

E. Bonaccorsi  and
M. Pasero
E. Bonaccorsi
Affiliation:
Dipartimento di Scienze della Terra, Università di Pisa and CNR-IGG, Via S. Maria 53, I-56126 Pisa, Italy
M. Pasero*
Affiliation:
Dipartimento di Scienze della Terra, Università di Pisa and CNR-IGG, Via S. Maria 53, I-56126 Pisa, Italy
*
* E-mail: pasero@dst.unipi.it
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Abstract

The crystal structure of sahlinite [Pb14(AsO4)2O9Cl4] from Lågban (Sweden) has been refined up to R = 0.071 using single-crystal diffraction data collected at the Elettra synchrotron facility. Sahlinite is monoclinic, space group C2/c, with a = 12.704(4), b = 22.576(5), c = 11.287(4) Å, β = 118.37(3)°. Sahlinite is isostructural with kombatite, its vanadium counterpart. Both are derivatives of the litharge form of PbO. In the structure of sahlinite there are seven independent Pb atoms, which are linked to Cl and/or O atoms, with coordination number ranging from V to VIII. The coordination polyhedra are irregularly shaped, due to the 6s2 lone-pair effect displayed by Pb2+.

Keywords

sahlinitecrystal structuresynchrotron datalone-pair effectLångban (Sweden).
Type
Research Article
Information
Mineralogical Magazine , Volume 67 , Issue 1 , February 2003 , pp. 15 - 21
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2003

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