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| Spectra Characterization of the Uvarovite in Anorthitic Jade |
| LIU Jia1, YANG Ming-xing1, 2*, DI Jing-ru1, 2, HE Chong2 |
1. Gemmological Institue, China University of Geosciences, Wuhan 430074, China
2. Gem Testing Center, China University of Geosciences, Wuhan 430074, China |
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Abstract The green minerals in Anorthitic Jade were considered to be uvarovite, which is a very rare member in natural garnet group. Uvarovite is very rare in natural conditions, the color is emerald green, uvarovite of high quality can be compared with Jade and Emerald. Predecessors have done some researches on the other end members of the garnets. However, little researches have been done on the uvarovite, no reports have been obtained about the spectrum characteristics of the uvarovite in Anorthitic Jade. The composition of this garnet was Uvt49.66Grs36.04Adr13.58Prp0.67Sps0.06 by using the JXA-8230 Electron Probe. Using the Bruker R200L Raman spectrometer, the Raman shifts we got of the sample were 1 000，890，879，830，618，589，530，508，399，370，270，240 and 176 cm-1，respectively, which have been influenced by the interaction of different trivalent cations Cr3+, Al3+ and Fe3+; Measurement of the infrared vibration frequency was performed using the Bruker V80 infrared spectrometer, acquiring the results of 1 019, 951, 908, 844, 826, 721, 669, 608, 538, 496, 462, 430 and 413 cm-1，respectively, the regular vibration excursion occurs due to the influence of the unit cell volume and the mass fraction of the trivalent cations; With the Jasco MSV-5200, the Micro-UV-Vis-NIR spectra shows that absorption peaks caused by electron transition of Cr3+were at 439, 613, 453 and 685 nm absorption were acromion, while a acromion absorption peaks caused by electron transition of Fe3+ was at 371 nm, the colored ion of the uvarovite is mainly Cr3+. The detailed spectrum study of the uvarovite in Anorthitic Jade provides rich spectral data for the identification of the garnet, and distinguishing from the similar traditional Dushan jade.
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Received: 2017-07-02
Accepted: 2017-11-12
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Corresponding Authors:
YANG Ming-xing
E-mail: 240419372@qq.com
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