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| Study on UV-Vis Absorption Spectra of Jadeite From Different Origins |
| MA Ping1, 2, Andy Hsitien Shen1*, ZHONG Yuan1, LUO Heng1 |
1. Gemmological Institute, China University of Geosciences (Wuhan), Wuhan 430074, China
2. Hubei Land Resources Vocational College，Wuhan 430090，China
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Abstract Jadeite is a kind of precious jade. The value of jadeite from different producing areas varies greatly, and jadeite from other origins passes off as Myanmar Jadeite to obtain a price increase. There is an urgent need for a reliable method to determine the geographical origin of jadeite. The research on the origin of jadeite has important gemmological significance. At present, jadeite from different origins is mainly discussed in the aspects of the generation age, mineral assemblage, jadeite component content, etc. There is no rapid and effective method to identify the origin. This paper takes jadeite from Myanmar, Russia and Guatemala as the research objects. It is found that there are two obvious absorption regions in the UV-Vis absorption spectrum of jadeite from different areas. The absorption peak at 437 nm in the ultraviolet region is the absorption of Fe3+, and the absorption peak at 430 nm is caused by the spin forbidden transition of Mn2+, but the absorption coefficient ranges of the UV-Vis absorption spectra of jadeite from the three origins are different. The absorption coefficient peak range at 430 nm is less than 0.62, and the absorption coefficient peak at 437 nm is less than 0.66, which is Myanmar Jadeite, and the absorption coefficient peak range at 430 nm is greater than 1.1, When the peak absorption coefficient at 437 nm is greater than 1.1, it is Guatemala jadeite. When the peak absorption coefficient at 430 nm is 0.62~1.14, when the peak absorption coefficient at 437 nm is 0.66~1.1, the jadeite areas of Russia, Guatemala and Myanmar coincide, which is the common area of jadeite from three origins. The MnO and FeO elements’ content was determined by laser denudation inductively coupled plasma mass spectrometry (LA-ICP-MS). It was found that the peaks of UV-Vis absorption coefficients at 430 and 437 nm in different jadeite origins were positively correlated with the content of MnO and FeO elements. This study UV-Vis absorption spectroscopy technology to the rapid identification of jadeite origins, which has certain practicability and feasibility.
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Received: 2021-05-20
Accepted: 2021-07-26
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Corresponding Authors:
Andy Hsitien Shen
E-mail: ahshen@foxmail.com
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