Jinrong WANG, Yiming WANG, Daqian ZHANG, Zhendong LIU, Chaowen WANG, Ke YIN, Xiaowen GAO, Yong XU. FTIR Investigation of Garnet: Indication for Specific Species and Coloration:A Case Study of A Yellow Garnet[J]. Journal of Gems & Gemmology, 2020, 22(1): 20-25. DOI: 10.15964/j.cnki.027jgg.2020.01.003
Citation: Jinrong WANG, Yiming WANG, Daqian ZHANG, Zhendong LIU, Chaowen WANG, Ke YIN, Xiaowen GAO, Yong XU. FTIR Investigation of Garnet: Indication for Specific Species and Coloration:A Case Study of A Yellow Garnet[J]. Journal of Gems & Gemmology, 2020, 22(1): 20-25. DOI: 10.15964/j.cnki.027jgg.2020.01.003

FTIR Investigation of Garnet: Indication for Specific Species and Coloration:A Case Study of A Yellow Garnet

  • A yellow garnet sample of unknown species was investigated by FTIR. The results indicated that garnets of calcium series and aluminum series could be distinguished by the typical A, B and C absorptions, and the specific species was further determined by the D absorption. The A, B, C and D FTIR absorptions of the yellow garnet sample are respectively located at 962, 862, 842 cm-1 and 611 cm-1, indicating that the yellow garnet sample is grossularite of calcium series. Based on the wave number of D absorption, the Al/(Fe+Al) value 0.843 of Y site was obtained, which is very close to the EPMA results. Coloration of the yellow garnet sample is attributed to the occurrence of Fe3+ at Y site. Also, the partial isomorphic replacement of Fe3+ to Al3+ at Y site results in the relative density and the refractive index of the yellow grossularite lying between grossularite end-member and andradite end-member. This investigation further confirms that FTIR can be used as a fast and effective method for the identification of garnet species and their colour genesis.
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