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The identification of Fe^(2+) in the M(4) site of calcic amphiboles

Goldman, Don S. and Rossman, George R. (1977) The identification of Fe^(2+) in the M(4) site of calcic amphiboles. American Mineralogist, 62 (3-4). pp. 205-216. ISSN 0003-004X.

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Evidence is presented for the occurrence of Fe^(2+) in the predominantly Ca-filled M(4) site of calcic amphiboles. Absorption bands in the electronic spectra at 1030 nm in β and at 2470 in a provide a sensitive means for identifying Fe^(2+) in this site. The large є value for the 1030 band, the large energy separation between both bands, and the similarity to the spectra of Fe^(2+) in large, highly distorted coordination sites in other minerals provide the basis for the M(4) site assignment. The energy splittings and polarization anisotropy of these bands are analyzed using a point-charge model based on C_(2v) symmetry. Spectral data indicate that the Fe^(2+) content in the M(4) site varies significantly among the calcic amphiboles.

Item Type:Article
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Rossman, George R.0000-0002-4571-6884
Additional Information:© 1977 Mineralogical Society of America. Manuscript received, April 28, 1976; accepted for publication, September 21, 1976. We wish to thank J. D. Hare (Caltech) and R. G. Burns (MIT) for discussing many aspects of the spectroscopic interpretation. We also appreciate the use of the Mössbauer spectrometer made available to us by W. A. Dollase (UCLA) and the many discussions with him concerning the analysis of the Mössbauer spectrum.
Group:UNSPECIFIED, Division of Geological and Planetary Sciences
Issue or Number:3-4
Record Number:CaltechAUTHORS:20130513-112453456
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Official Citation:The identification of Fe2+ in the M(4) site of calcic amphiboles Don S. Goldman and George R. Rossman 205-216, 1977
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:38447
Deposited By: Ruth Sustaita
Deposited On:13 May 2013 18:37
Last Modified:26 Nov 2019 11:15

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