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Crystal chemistry of a natural schorlomite and Ti-andradites synthesized at different oxygen fugacities

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Abstract

Ti-andradites were synthesized at a pressure of P(H2O)=3 kbar and temperatures of 700–800° C. Oxygen fugacities were controlled by solid state buffers (Ni/NiO; SiO2 + Fe/Fe2SiO4). The Fe2+-and Fe3+-distribution was determined by low temperature Mössbauer spectroscopy. The water content was measured by a solid's moisture analyzer. The chemical composition of the synthetic and the natural sample has been determined by electron microprobe. Ti-andradites from runs at high oxygen fugacities have Fe3+ on octahedral and tetrahedral sites; Ti-andradites from runs at low oxygen fugacities have tetrahedrally and octahedrally coordinated Fe2+ as well. These “reduced” garnets must also contain Ti3+ on octahedral sites. Charge balance is maintained due to substitution of O2− by (OH)− by two mechanisms: (SiO4)4− ⇌ (O4H4)4− and (Fe3+O6)9− ⇌ (Fe2+O5OH)9−. FTIR spectra of the synthetic samples do show the presence of structurally bound (OH)−. In a natural sample tetrahedrally and octahedrally coordinated Fe3+ are observed together with Fe2+ on all three cation sites of the garnet structure.

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Authors and Affiliations

  1. Mineralogisch-Petrographisches Institut der Universität München, Theresienstrasse 41, D-8000, München 2, Federal Republic of Germany

    A. Kühberger, T. Fehr & H. G. Huckenholz

  2. Institut für Geowissenschaften der Universität Salzburg, Abteilung Mineralogie, Petrographie und Lagerstättenkunde, Hellbrunnerstrasse 34, A-5020, Salzburg, Austria

    G. Amthauer

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  1. A. Kühberger
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  2. T. Fehr
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  3. H. G. Huckenholz
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  4. G. Amthauer
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Kühberger, A., Fehr, T., Huckenholz, H.G. et al. Crystal chemistry of a natural schorlomite and Ti-andradites synthesized at different oxygen fugacities. Phys Chem Minerals 16, 734–740 (1989). https://doi.org/10.1007/BF00209694

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  • DOI: https://doi.org/10.1007/BF00209694

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