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The hydrous components in garnets: Grossular-hydrogrossular

Rossman, George R. and Aines, Roger D. (1991) The hydrous components in garnets: Grossular-hydrogrossular. American Mineralogist, 76 (7-8). pp. 1153-1164. ISSN 0003-004X.

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Grossular garnets from 33 localities were examined for indications of OH- or H_2O in their infrared spectrum. All contained OH-. Classical hydrogrossular with more than 5 wt% H_2O displays systematics pectroscopic behavior consistent with the hydrogarnet substitution consisting of two absorption bands at 3598 and 3662 cm^(-1). These spectroscopic characteristics were generally not observed in other glossular samples. Instead, 20 distinct absorption bands have been identified in the spectra of common grossular, occurring in groups of four to ten bands. Both the number and intensities of these bands show a large variation, which does not correspond with the garnet's composition. Seven classes of spectra were identified in the OH region based on the position of the most intense absorption band. The spectroscopic data suggest that in addition to the tetrahedral site, OH groups exist in multiple other environments. The OH content of grossular garnets can be obtained from infrared spectra using the equation H_2O wt% = 0.0000786 x integrated absorbance per cm in the OH region near 3600 cm^(-1). The OH content of macroscopic grossular crystals (expressed as weight percent H_2O) ranged from 12.8% doown to less than 0.005%. Macroscopic grossular typically contains less than 0.3 wt% H_2O. Grossular from rodingites and low-temperature alteration vugs contained much more than that from skarn or contact metamorphic environments.

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Rossman, George R.0000-0002-4571-6884
Additional Information:© 1991 Mineralogical Society of America. Manuscript Received August 20, 1990. Manuscript Accepted April 18, 1991. We thank D.G. Schlom for assisting with our synthesis of hydrogarnet and G.A. Lager (University of Kentucky) for providing samples of his synthetic hydrogarnets and numerous helpful discussions about the hydrogamet substitution. Other garnets for this study were donated by A.L. Albee (Caltech), F.M. Allen (Arizona State University), G Amthauer (Salzburg), D. Atkinson (Santa Barbara), R. Basso (Genoa), C. Bridges (Nairobi), B. Cannon (Seattle), R. Coleman (Stanford), R.H. Currier (Arcadia), P. Flusser (Los Angeles), C. Francis (Harvard Mineral Museum), M. Gray (Culver City), G. Harlow (American Museum), W.A. Henderson (Stanford), H S. Hill (Altadena), P. Keller (Los Angeles County Museum), G.A. Novak (California State University, Los Angeles), and Y. Takeuchi (Tokyo). This study was funded in part by NSF grants EAR-7919987, EAR-8313098, EAR-8618200, and EAR-8916064. Contribution no. 4449.
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Caltech Division of Geological and Planetary Sciences 4449
Issue or Number:7-8
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Official Citation: George R. Rossman and Roger D. Aines The hydrous components in garnets; grossular-hydrogrossular American Mineralogist, August 1991, v. 76, p. 1153-1164
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:44032
Deposited By: Ruth Sustaita
Deposited On:27 Feb 2014 21:00
Last Modified:03 Oct 2019 06:13

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