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The stability of onoratoite, Sb8O11Cl2, in the supergene environment

Published online by Cambridge University Press:  05 July 2018

Adam J. Roper ,
Peter Leverett ,
Timothy D. Murphy  and
Peter A. Williams
Adam J. Roper
Affiliation:
School of Science and Health, University of Western Sydney, Locked Bag 1797, Penrith, New South Wales 2751, Australia
Peter Leverett
Affiliation:
School of Science and Health, University of Western Sydney, Locked Bag 1797, Penrith, New South Wales 2751, Australia
Timothy D. Murphy
Affiliation:
School of Science and Health, University of Western Sydney, Locked Bag 1797, Penrith, New South Wales 2751, Australia
Peter A. Williams*
Affiliation:
School of Science and Health, University of Western Sydney, Locked Bag 1797, Penrith, New South Wales 2751, Australia
*
E-mail: p.williams@uws.edu.au
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Abstract

Synthesis and solubility studies of onoratoite have been undertaken to determine the role of this rare secondary phase in the immobilization of Sb and the conditions responsible for its formation in the supergene zone. Solubility studies were undertaken at 298.15 K. A value of ΔGfθ (Sb8O11Cl2, s, 298.15 K) = –2576 ±12 kJ mol–1 was derived. Calculations involving sénarmontite, Sb2O3, klebelsbergite, Sb4O4SO4(OH)2 and schafarzikite, FeSb2O4, show that onoratoite is a thermodynamically stable phase only at negligible activities of SO42–(aq) and low activities of Fe2+(aq), at low pH and very high activities of Cl–(aq). This explains why onoratoite is such a rare secondary phase and why it cannot exert any significant influence on the dispersion of Sb in the supergene environment.

Keywords

onoratoiteantimony oxychloridesolubilitystabilitychemical mineralogysupergene zone
Type
Research Article
Information
Mineralogical Magazine , Volume 78 , Issue 7 , December 2014 , pp. 1671 - 1675
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2014

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