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Structure of fougerite and green rusts and a thermodynamic model for their stabilities

Authors
Journal
Journal of Geochemical Exploration
0375-6742
Publisher
Elsevier
Publication Date
Volume
88
Identifiers
DOI: 10.1016/j.gexplo.2005.08.048
Keywords
  • Fe
  • Fougerite
  • Green Rusts
  • Thermodynamics
Disciplines
  • Chemistry
  • Earth Science
  • Physics

Abstract

Abstract Fougerite is a new iron oxide, a mixed M(II)–M(III) hydroxide, a member of the green rust group. Its structure consists of a brucitic layer of Fe(III)–Fe(II)–Mg(II), where the excess of the positive charge due to Fe 3+ is compensated in the interlayer by anions. The limits of composition are structurally and geochemically constrained, and the stabilities of the mineral and green rusts are obtained by a thermodynamic model of a regular solid solution, for different compensating anions and for any allowed composition of the brucitic layer.

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