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Fe^(2+)-Fe^(3+) interactions in tourmaline

Mattson, Stephanie M. and Rossman, George R. (1987) Fe^(2+)-Fe^(3+) interactions in tourmaline. Physics and Chemistry of Minerals, 14 (2). pp. 163-171. ISSN 0342-1791. doi:10.1007/BF00308220.

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The color and spectroscopic properties of ironbearing tourmalines (elbaite, dravite, uvite, schorl) do not vary smoothly with iron concentration. Such behavior has often been ascribed to intervalence charge transfer between Fe^(2+) and Fe^(3+) which produces a new, intense absorption band in the visible portion of the spectrum. In the case of tourmaline, an entirely different manifestation of the interaction between Fe^(2+) and Fe^(3+) occurs in which the Fe^(2+) bands are intensified without an intense, new absorption band. At low iron concentrations, the intensity of light absorption from Fe^(2+) is about the same for E∥c and E⊥c polarizations, but at high iron concentrations, the intensity of the E⊥c polarization increases more than ten times as much as E∥c. This difference is related to intensification of Fe^(2+) absorption by adjacent Fe^(3+). Extrapolations indicate that pairs of Fe^(2+)-Fe^(3+) have Fe^(2+) absorption intensity ∼200 times as great as isolated Fe^(2+). Enhanced Fe^(2+) absorption bands are recognized in tourmaline by their intensity increase at 78 K of up to 50%. Enhancement of Fe^(2+) absorption intensity provides a severe limitration on the accuracy of determinations of Fe^(2+) concentration and site occupancy by optical spectroscopic methods. Details of the assignment of tourmaline spectra in the optical region are reconsidered.

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Rossman, George R.0000-0002-4571-6884
Additional Information:© 1987 Springer-Verlag. Received September 3, 1985. This study was facilitated by the following individuals who provided samples of tourmalines: R.H. Currier (Arcadia, CA), Mike Gray (Mid Pines), W.F. Larson (Fallbrook), P. Flusser (Los Angeles), Carl Francis (Harvard), and John S. White (Smithsonian), and by Roger Burns (MIT) and Glen Waychunas (Stanford) who provided Mossbauer spectra. Funding for this project was provided in part by the National Science Foundation, grants EAR 79-04801 and EAR 82-12540.
Group:UNSPECIFIED, Division of Geological and Planetary Sciences
Funding AgencyGrant Number
NSFEAR 79-04801
NSFEAR 82-12540
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Caltech Division of Geological and Planetary Sciences4261
Issue or Number:2
Record Number:CaltechAUTHORS:20140306-085514791
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Official Citation: Fe2+-Fe3+ interactions in tourmaline Stephanie M. Mattson, George R. Rossman Pages 163-171
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:44168
Deposited By: Ruth Sustaita
Deposited On:06 Mar 2014 18:00
Last Modified:10 Nov 2021 16:48

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