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The crystal structure of veenite

Published online by Cambridge University Press:  02 January 2018

Dan Topa  and
Emil Makovicky
Dan Topa*
Affiliation:
Natural History Museum Vienna, Burgring 7, 1010 Vienna, Austria
Emil Makovicky
Affiliation:
Institute for Geoscience and Mineral Resources Management, University of Copenhagen, Østervoldgade 10, DK-1350, Copenhagen K, Denmark
*
*E-mail: [email protected]
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Abstract

The crystal structure of veenite is reported for the first time from a sample from the type locality of Madoc (Ontario, Canada). It has been solved and refined by X-ray single-crystal diffraction on the basis of 4973 observed reflections (with Fo > 4σ(Fo)) with a final R1 = 0.0396. Veenite is monoclinic P21, with unit-cell parameters a = 8.429(2), b = 26.069(5), c = 8.962(2) Å, β = 117.447(2)o. The bulk veenite composition is Ag0.15Pb16.029Sb8.836As6.99S39.95 (for Z = 1) corresponding to N = 4.09 (Me8NS8N + 8, theoretical value is 4.0), with the percentage of the Ag-(As,Sb) substituted end-member only equal to 3.51 mol.%, i.e., a nearly pure Pb-Sb-As sulfosalt. The crystal structure is typical for the N = 4 sartorite homologue, with zig-zag walls of trigonal coordination prisms of Pb which separate slabs of diagonally oriented double-layers populated by Sb and As with partial Pb substitution. Orientation of three-membered crankshaft chains formed by strong (As,Sb) – S bonds on the two surfaces of double-layers differs substantially from that in dufrénoysite, which is a pure Pb-As (N = 4) sulfosalt.

Keywords

veenitesingle-crystal structuredufrÉnoysitesartorite homologous seriesMadocCanada
Type
Research Article
Information
Mineralogical Magazine , Volume 81 , Issue 2 , April 2017 , pp. 355 - 368
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2017

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CIF

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