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Feasibility of determining the quantitative OH content of garnets with Raman spectroscopy

Arredondo, Elizabeth H. and Rossman, George R. (2002) Feasibility of determining the quantitative OH content of garnets with Raman spectroscopy. American Mineralogist, 87 (2-3). pp. 307-311. ISSN 0003-004X.

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Two suites of garnets were examined by infrared absorption spectroscopy and depolarized Raman spectroscopy to determine if the Raman signal could be used as a quantitative measurement of OH content. To avoid the problems of determining the absolute Raman signal intensity, the integrated intensity of the OH bands was ratioed to the integrated intensity of silicate Si-O stretching bands and used as a proxy for the OH intensity. These were compared to the OH contents, expressed as wt% H_2O, independently determined from infrared absorption. A somewhat useful trend developed between OH contents determined by Raman and IR for some grossular garnets with H_2O contents less than 0.5%. Many colorless to near-colorless grossular garnets do not provide a useful Raman signal due to fluorescence, although other samples with H_2O contents between 0.5 and 1.3 wt% and are strongly colored, fall far below the trend of the samples with lower H_2O-contents. Spessartine-almandine garnets from the Rutherford no. 2 pegmatite all respond to the Raman experiment, but produce a confusing trend when compared to H_2O. Coincidentally, a relatively smooth but decreasing trend was observed when the spessartine Raman OH intensity ratio was compared to the iron content. These observations suggest that Raman measurements by this method are not suitable, in general, for the determination of OH in garnets.

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Rossman, George R.0000-0002-4571-6884
Additional Information:© 2002 Mineralogical Society of America. Manuscript Received February 19, 2001; Manuscript Accepted November 7, 2001. Manuscript handled by M. Darby Dyar. This study was made possible through the support of the National Science Foundation, grant EAR-9804871, and the White Rose Foundation. We thank B. Kolesov and an anonymous referee for helpful comments that improved the manuscript.
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White Rose FoundationUNSPECIFIED
Issue or Number:2-3
Record Number:CaltechAUTHORS:20130412-092257301
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Official Citation: Elizabeth H. Arredondo and George R. Rossman Feasibility of determining the quantitative OH content of garnets with Raman spectroscopy American Mineralogist, February-March, v. 87, p. 307-311
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:37900
Deposited By: Tony Diaz
Deposited On:16 Apr 2013 19:33
Last Modified:03 Oct 2019 04:52

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