Elastic properties of pyrope |
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Authors: | Bridget O'Neill Jay D Bass George R Rossman Charles A Geiger Klaus Langer |
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Institution: | 1. Department of Geology, University of Illinois, 1301 W. Green St., 61801, Urbana, IL, USA 3. Division of Geological and Planetary Sciences, California Institute of Technology, 91125, Pasadena, CA, USA 4. Institut für Mineralogie und Kristallographie, Technische Universit?t Berlin, Ernst Reuter Platz 1, W-1000, Berlin 12, Federal Republic of Germany
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Abstract: | Brillouin spectroscopy was used to measure the single crystal elastic properties of a pure synthetic pyrope and a natural garnet containing 89.9 mol% of the pyrope end member (Mg3Al2Si3O12). The elastic moduli, c
ij
, of the two samples are entirely consistent and agree with previous estimates of the elastic properties of pyrope based upon the moduli of solid solutions. Our results indicate that the elastic moduli of pyrope end-member are c
11=296.2±0.5, c
12=111.1±0.6, c
44=91.6±0.3, Ks=172.8±0.3, =92.0±0.2, all in units of GPa. These results differ by several percent from those reported previously for synthetic pyrope, but are based upon a much larger data set. Although the hydrous components of the two samples from the present study are substantially different, representing both dry and saturated samples, we find no discernable effect of structurally bound water on the elastic properties. This is due to the small absolute solubility of water in pyrope, as compared with other garnets such as grossular. |
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