Infrared spectra have been measured on 22 specimens of silicate garnet and Raman spectra on 6 specimens. Seventeen IR modes were found as predicted by a factor group analysis. Not all of the predicted 25 Raman lines were found. The factor group splitting of the tetrahedral vibrations correlates with the occupancies of the octahedral and cubal sites. The site group splitting was used to measure the distortion of the garnet tetrahedral site.

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