Abstract
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 - . Amounts up to 6 wt% H 2 O occur in these samples; those from low-temperature formations contain the most OH - . Some features in the absorption spectra indicate the hydrogamet substitution (SiO 4 ) 4- ↔(O 4 H 4 ) 4- whereas others indicate additional types of OH - incorporation. The complexity of the spectra due to multi-site distribution of OH - increases with increasing complexity of the garnet composition.
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