Fe2+ -F avoidance in silicates |
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| Authors: | Philip E Rosenberg Franklin F Foit |
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| Institution: | Department of Geology, Washington State University, Pullman, Washington 99163, U.S.A. |
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| Abstract: | Fe2+-F avoidance, reported in the literature in micas and amphiboles, can be accounted for by crystal field theory. The crystal field splitting parameter, ΔO, of Fe2+ octahedrally coordinated to F? is significantly smaller than its value when (OH)? is the coordinating anion. Thus, the presence of Fe2+ is not favored at sites where F? substitutes for (OH)? due to smaller crystal field stabilization energy. |
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