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Simultaneous refinement of two components of an exsolution intergrowth; crystal structures of the lindstroemite-krupkaite pair

Dan Topa, Vaclav Petricek, Michal Dusek, Emil Makovicky and Tonci Balic-Zunic
Simultaneous refinement of two components of an exsolution intergrowth; crystal structures of the lindstroemite-krupkaite pair
The Canadian Mineralogist (April 2008) 46 (2): 525-539

Abstract

Crystal structures of intergrown lindstromite and krupkaite were determined in two distinct samples by a simultaneous crystal-structure refinement using a modified JANA program package. The exsolution intergrowths have a bulk composition, determined by means of electron microprobe, equal to bd (sub 60.1) and bd (sub 64.1) , respectively. The subscript indicates a percentage of the aikinite component in this bismuthinite derivative. The crystal structure of lindstromite contains two aikinite-like ribbons Cu (sub 2) Pb (sub 2) Bi (sub 2) S (sub 6) and eight krupkaite-like ribbons (ideally CuPbBi (sub 3) S (sub 6) ) in a unit cell. The latter are oversubstituted; the ideally empty tetrahedral sites associated with them refined to the occupancy values of 0.04-0.09 Cu and 0.14-0.18 Cu, respectively, for the two above bulk compositions. The refined phase-compositions are Cu (sub 6.26) Pb (sub 6.26) Bi (sub 13.74) S (sub 30) (bd (sub 62.6) ) associated with CuPbBi (sub 3) S (sub 6) (bd (sub 50) ) for the sample "bd (sub 60) " and Cu (sub 6.64) Pb (sub 6.64) Bi (sub 13.36) S (sub 30) (bd (sub 66.4) ) associated with oversubstituted krupkaite, the composition of which could not been refined, for the sample "bd (sub 64) ". From stoichiometry calculations, the latter is approximately bd (sub 60.) Both latter values may be somewhat overestimated as a result of cross-correlations between the two closely related structures during the refinement.


ISSN: 0008-4476
EISSN: 1499-1276
Coden: CAMIA6
Serial Title: The Canadian Mineralogist
Serial Volume: 46
Serial Issue: 2
Title: Simultaneous refinement of two components of an exsolution intergrowth; crystal structures of the lindstroemite-krupkaite pair
Affiliation: University of Salzburg, Division of Mineralogy, Salzburg, Austria
Pages: 525-539
Published: 200804
Text Language: English
Publisher: Mineralogical Association of Canada, Ottawa, ON, Canada
References: 22
Accession Number: 2008-102394
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 10 tables
Secondary Affiliation: Academy of Sciences of Czech Republic, CZE, Czech RepublicUniversity of Copenhagen, DNK, Denmark
Country of Publication: Canada
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Mineralogical Association of Canada. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 200835
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