Journal of the Faculty of Science, Hokkaido University. Series 4, Geology and mineralogy;Vol.XVIII, No.4

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Optical Anomaly Garnet and its Stability Field at High Pressures and Temperatures

Hariya, Yu;Kimura, Makoto

Permalink : http://hdl.handle.net/2115/36673

Abstract

The natural anisotropic garnets from the skarn deposits in Japan were found a wide range of chemical compositions of grossular-andradite solid solution. No relationship between chemical compositions and the optical properties was found. Anisotropic garnet and its stability field have been studied in the pressure range of 250-1,500 bar and the temperature range of 550-870℃ with or without H2O and CO2. The transition boundary from anisotropic to isotropic form was negative, and the stability field of anisotropic garnet is relatively low pressures and temperatures under H2O and CO2 conditions.

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