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GEOREF RECORD

Chessboard structures; atom-scale imaging of homologs from the kobellite series

Wei Li, Cristiana L. Ciobanu, Ashley Slattery, Nigel J. Cook, Wenyuan Liu, Benjamin P. Wade and Guiqing Xie
Chessboard structures; atom-scale imaging of homologs from the kobellite series
American Mineralogist (March 2019) 104 (3): 459-462

Abstract

High-angle annular dark-field scanning transmission electron microscopy is a powerful Z-contrast technique able to depict the structural motifs in Pb-(Bi-Sb)-sulfosalts. Using two homologs from the kobellite homologous series, a group of "chessboard derivative structures," represented by Bi-, and Sb-rich pairs of natural phases (the kobellite-tintinaite isotypic series and giessenite-izoklakeite homeotypic series), we visualize the slabs underpinning crystal structural modularity for the N = 2 homolog kobellite and the N = 4 homolog, in this case a Bi-rich izoklakeite [Sb/(Sb+Bi) = 0.35]. The homolog number, N, can be readily calculated as N = n1/6 - 1 and N = n2/4, where n1 and n2 are the numbers of atoms in the PbS- and SnS-motifs, respectively. Atom-scale imaging of thinned foils extracted in situ from samples for which compositional data are available also reveals syntactic unit-cell scale intergrowths on [001] zone axis with akobellite bizoklakeite. These are as small as half-unit cells of bizoklakeite and one-unit cell akobellite. Replacement relationships are also observed as irregular slabs of kobellite "intruding" into izoklakeite. Both banded and irregular intergrowths account for the compositional fields measured at the micrometer scale.


ISSN: 0003-004X
EISSN: 1945-3027
Coden: AMMIAY
Serial Title: American Mineralogist
Serial Volume: 104
Serial Issue: 3
Title: Chessboard structures; atom-scale imaging of homologs from the kobellite series
Affiliation: University of Adelaide, School of Chemical Engineering, Adelaide, South Aust., Australia
Pages: 459-462
Published: 201903
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
References: 28
Accession Number: 2019-024155
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
Secondary Affiliation: Chinese Academy of Geological Sciences, CHN, ChinaChina University of Geosciences, CHN, ChinaFuzhou University, CHN, China
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Abstract, copyright, Mineralogical Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201914
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