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American Mineralogist; August 1998; v. 83; no. 7-8; p. 835-840
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The hydrous component in andradite garnet

Georg Amthauer, and George R. Rossman

California Institute of Technology, Division of Geological and Planetary Sciences, Pasadena, CA, United States

Twenty-two andradite samples from a variety of geological environments and two synthetic hydroandradite samples were studied by Fourier transform IR spectroscopy. Their spectra show that H enters andradite in the form of OH (super -) . Amounts up to 6 wt% H 2 O occur in these samples; those from low-temperature formations contain the most OH (super -) . Some features in the absorption spectra indicate the hydrogarnet substitution (SiO 4 ) (super 4-) <-->(O 4 H 4 ) (super 4-) whereas others indicate additional types of OH (super -) incorporation. The complexity of the spectra due to multi-site distribution of OH (super -) increases with increasing complexity of the garnet composition.

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