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GEOREF RECORD

The crystal structure of veenite

Dan Topa and Emil Makovicky
The crystal structure of veenite
Mineralogical Magazine (April 2017) 81 (2): 355-368

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 F (sub o) > 4sigma (F (sub o) )) with a final R (sub 1) = 0.0396. Veenite is monoclinic P2 (sub 1) , with unit-cell parameters a = 8.429(2), b = 26.069(5), c = 8.962(2) A, beta = 117.447(2) (super o) . The bulk veenite composition is Ag (sub 0.15) Pb (sub 16.029) Sb (sub 8.836) As (sub 6.99) S (sub 39.95) (for Z = 1) corresponding to N = 4.09 (Me (sub 8N) S (sub 8N) (sub +) (sub 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 dufrenoysite, which is a pure Pb-As (N = 4) sulfosalt.


ISSN: 0026-461X
EISSN: 1471-8022
Coden: MNLMBB
Serial Title: Mineralogical Magazine
Serial Volume: 81
Serial Issue: 2
Title: The crystal structure of veenite
Affiliation: Natural History Museum Vienna, Vienna, Austria
Pages: 355-368
Published: 201704
Text Language: English
Publisher: Mineralogical Society, London, United Kingdom
References: 15
Accession Number: 2017-050148
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 6 tables
N44°07'00" - N45°28'00", W78°13'60" - W77°00'00"
Secondary Affiliation: University of Copenhagen, DNK, Denmark
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201727
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