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American Mineralogist; August 2003; v. 88; no. 8-9; p. 1197-1203
© 2003 Mineralogical Society of America
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The structural evolution of mercury sulfide precipitate: an XAS and XRD study

John M. Charnock1,2,3,*, Lesley N. Moyes2, Richard A. D. Pattrick3, J. Frederick W. Mosselmans1, David J. Vaughan3 and Francis R. Livens2

1 CLRC Daresbury Laboratory, Warrington, Cheshire WA4 4AD, U.K.
2 Department of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, U.K.
3 Department of Earth Sciences, University of Manchester, Oxford Road, Manchester M13 9PL, U.K.

Correspondence: * E-mail: j.m.charnock{at}dl.ac.uk

We investigated structural changes during precipitation of HgS from sulfidic solutions using X-ray absorption and X-ray diffraction techniques. The results show that initially an unstable low Hg coordination complex forms that is probably chain-like in structure, with one sulfide atom at 2.35 Å and one at 2.97 Å. This is rapidly transformed to a four-coordinate mercury sulfide compound that initially forms as clusters with the local ordering characteristics of cubic metacinnabar. However, during aggregation the black Hg-S precipitate loses its initial longer-range ordering and becomes pseudocubic. As it ages, the pseudocubic structure transforms to a cubic structure, and then to stable crystalline metacinnabar. This study provides clear evidence that the precipitation and formation of metal sulfides is a complex multistage process.




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V. L. TAUSON, I. Yu. PARKHOMENKO, D. N. BABKIN, V. I. MEN'SHIKOV, and E. E. LUSTENBERG
Cadmium and mercury uptake by galena crystals under hydrothermal growth: A spectroscopic and element thermo-release atomic absorption study
European Journal of Mineralogy, August 1, 2005; 17(4): 599 - 610.
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