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Spectroscopy of Micas

Rossman, George R. (1984) Spectroscopy of Micas. In: Micas. Reviews in mineralogy. No.13. Mineralogical Society of America , Washington, DC, pp. 145-181. ISBN 9780939950171. https://resolver.caltech.edu/CaltechAUTHORS:20130509-140155377

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Abstract

This chapter is concerned with spectroscopic studies of micas which address the origin of their color and pleochroism, the oxidation states and concentrations of cations, site occupancies and other structural details, thermodynamic properties, and broader aspects of the chemical-physics of spectroscopic interactions in general. The field of mica spectroscopy has not previously been reviewed as a whole, although chapters in Lazarev (1972) and Farmer (1974) discuss the infrared spectroscopy of layer silicates as a group. The three primary spectroscopic methods used in this study are Mössbauer absorption, optical absorption, and infrared absorption. Mössbauer spectra measure the absorption of gamma rays by ^(57)Fe nuclei. The details of a spectrum are determined by the crystallographic site and oxidation state of the iron atoms (see review by Bancroft, 1973). Optical spectra in the ultraviolet, visible, and near-infrared spectral regions respond to oxidation state and coordination environment of a variety of metal ions, and can be strongly influenced by interactions with next-nearest neighbors, especially when adjacent ions are in different oxidation states (see review by Burns, 1970). Absorption in the infrared spectral region occurs when local units of a crystal are set in motion by the energy of incident radiation. Electron spin resonance (ESR) spectra and especially nuclear magnetic resonance (NMR) spectra are finding greater use in the study of micas. ESR spectra respond to metal ions which have unpaired electrons and are especially applicable when they are at low concentrations. NMR spectra can monitor structural details of Al, Si, Na, H, and F.


Item Type:Book Section
ORCID:
AuthorORCID
Rossman, George R.0000-0002-4571-6884
Additional Information:© 1984 Mineralogical Society of America.
Series Name:Reviews in mineralogy
Issue or Number:13
Record Number:CaltechAUTHORS:20130509-140155377
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20130509-140155377
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:38394
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:15 May 2013 21:43
Last Modified:26 Nov 2019 11:15

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