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Ferric Iron in Tourmaline

Mattson, Stephanie M. and Rossman, George R. (1984) Ferric Iron in Tourmaline. Physics and Chemistry of Minerals, 11 (5). pp. 225-234. ISSN 0342-1791. doi:10.1007/BF00308137.

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Red Fe^(3+)-rich and black Fe^(3+), Fe^(2+)-rich tourmalines have been studied by optical and Mössbauer spectroscopies to determine the optical characteristics of Fe^(3+) in tourmaline. Prominent optical absorption features at 485 and 540 nm are assigned to transitions of multiple exchange-coupled Fe^(3+) pairs in several site combinations. These transitions are more intense than those of isolated Fe^(3+) and are polarized along the vector between the interacting ions, thus permitting site assignments. The 485 nm band occurs at an unusually low energy for Fe^(3+) in silicate minerals. Similar behavior has been observed in the spectrum of coalingite, Mg_(10)Fe_2^(3+) (OH)_(24)CO_(3)·2H_2O, in which Fe^(3+) occurs in related pairs in edge-shared sheets. These lower energies are proposed to result from magnetic exchange in edge-shared geometries. Antiferromagnetic exchange has been confirmed by a variable temperature magnetic susceptibility study of a Kenyan dravite with 3.36 wt percent Fe. The Mössbauer spectrum of this sample is unusual in that it shows a pronounced decrease in width of component peaks from 298 K to 5 K.

Item Type:Article
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Rossman, George R.0000-0002-4571-6884
Additional Information:© 1984 Springer-Verlag. Received April 16, 1984. Special thanks are given to Pete Dunn (Smithsonian Institution), Pete Flusser (Los Angeles), Robert Gaal and Peter Keller (Gemmological Institue of America), Julius Petsch (Idar-Oberstein), and Roger Burns (MIT) for providing samples. We would like to thank Wayne Dollase (UCLA), Georg Amthauer (Marburg), and Roger Burns (MIT) for providing Mossbauer spectra and helpful discussions. Our appreciation is also extended to Peter Boyd (USC) for assistance in obtaining the magnetic susceptibility data and Edward Stolper (Caltech) for the use of controlled atmosphere ovens. This study was funded in part by NSF grants EAR 8212540 and EAR 7904801.
Funding AgencyGrant Number
NSFEAR 8212540
NSFEAR 7904801
Issue or Number:5
Record Number:CaltechAUTHORS:20140306-082932076
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Official Citation: Ferric iron in tourmaline Stephanie M. Mattson, George R. Rossman Pages 225-234
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:44167
Deposited By: Ruth Sustaita
Deposited On:06 Mar 2014 16:59
Last Modified:10 Nov 2021 16:48

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