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The stability of the rare sodium antimonate, brizziite, and it's role in Sb mobility

Published online by Cambridge University Press:  28 February 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 2451, Australia
Peter Leverett
Affiliation:
School of Science and Health, University of Western Sydney, Locked Bag 1797, Penrith, New South Wales 2451, Australia
Timothy D. Murphy
Affiliation:
School of Science and Health, University of Western Sydney, Locked Bag 1797, Penrith, New South Wales 2451, Australia
Peter A. Williams
Affiliation:
School of Science and Health, University of Western Sydney, Locked Bag 1797, Penrith, New South Wales 2451, Australia
*
*Email: [email protected]
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Abstract

Synthesis and solubility studies of brizziite, NaSbO3, have been undertaken to determine the possible role of this rare secondary phase in the immobilization of Sb under supergene conditions and the conditions responsible for its formation in the supergene zone. Solubility studies were undertaken at T = 298.15 K. A value of ΔGfө) (NaSbO3, s, 298.15 K) = –806.66 ± 1.4 kJ mol–1 was derived. Calculations involving tripuhyite, FeSbO4, byströmite, MgSb2O6, ordoñezite, ZnSb2O6 and rosiaite, PbSb2O6, show that brizziite is a thermodynamically stable phase only at negligible activities of Pb2+(aq) at high pH and high salinity. Calculations involving mopungite Na[Sb(OH)6] combined with reported mineral associations suggest that mopungite is the thermodynamically unstable precursor to brizziite and its presence in natural settings must be due to kinetic stability. This explains why brizziite is such a rare secondary phase and therefore why it cannot exert any significant influence on the dispersion of Sb in the supergene environment.

Keywords

brizziiteantimonysolubilitystabilitychemical mineralogysupergene zone
Type
Article
Information
Mineralogical Magazine , Volume 82 , Issue 1 , February 2018 , pp. 89 - 93
Copyright
Copyright © Mineralogical Society of Great Britain and Ireland 2018 

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Footnotes

Associate Editor: Juraj Majzlan

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