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Crystal structure of macphersonite (Pb4SO4(CO3)2(OH)2): comparison with leadhillite

Published online by Cambridge University Press:  05 July 2018

Ian M. Steele ,
Joseph J. Pluth  and
Alec Livingstone
Ian M. Steele
Affiliation:
Department of Geophysical Sciences, The University of Chicago, Chicago IL 60637, USA
Joseph J. Pluth
Affiliation:
Department of Geophysical Sciences, The University of Chicago, Chicago IL 60637, USA Consortium for Advanced Radiation Sources, The University of Chicago, Chicago IL 60637, USA Materials Research Science and Engineering Center, The University of Chicago, Chicago IL 60637, USA
Alec Livingstone
Affiliation:
Department of Geology, The Royal Museum of Scotland, Chambers St., Edinburgh EH1 1JF, UK
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Abstract

The crystal structure of macphersonite (Pb4SO4(CO3)2(OH)2, Pcab, a = 9.242(2), b = 23.050(5), c = 10.383(2) Å) from Leadhills, Scotland has been determined to an R = 0.053. The structure has many features in common with its polymorph leadhillite including three distinct types of layers. Layer A includes sulphate tetrahedra, Layer B is composed of Pb and OH, while Layer C is composed of Pb and CO3 with topology identical to that in cerussite. In both macphersonite and leadhillite these layers are stacked along [010] as …BABCCBABCC… The double CC layer is almost identical in the two structures and forms a structural backbone and occurs in other structures including hydrocerussite and plumbonacrite. The sulphate layer shows the greatest difference between the two structures and can be described by a pattern of up or down pointing tetrahedra. For macphersonite the sequence along [001] is …UDUDUD… while in leadhillite the sequence along [010] is …UDDUUDDU… This latter sequence effectively doubles b relative to the equivalent direction in macphersonite. Susannite, a third polymorph, may have yet another sequence of sulphates to give trigonal symmetry; by heating leadhillite, displacive movements of sulphate groups may occur with a conversion to susannite.

Keywords

macphersoniteleadhillitesusannitecerussitehydrocerussitecarbonatesulphate
Type
Research Article
Information
Mineralogical Magazine , Volume 62 , Issue 4 , August 1998 , pp. 451 - 459
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1998

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Footnotes

5

Present address: 6 St. Ronan's Terrace, Innerleithen, Peeblesshire EH44 6RB, Scotland

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