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| Study on Spectral Characteristics of Scheelite From Xuebaoding, Pingwu County, Sichuan Province, China |
| LIU Xian-yu1, YANG Jiu-chang1, 2, TU Cai1, XU Ya-fen1, XU Chang3, CHEN Quan-li2* |
1. College of Jewelry, Shanghai Jian Qiao University, Shanghai 201306, China
2. Gemmological Institute, China University of Geosciences (Wuhan), Wuhan 430074, China
3. Faculty of Earth Sciences, China University of Geosciences (Wuhan), Wuhan 430074, China
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Abstract The Xuebaoding deposit which locates in Huya Township, Pingwu County, Mianyang City, Sichuan province, produces a kind of big rare orange scheelite with perfect crystal shape that collectors of gemstones and mineral crystals favor. The conventional gemological characteristics，infrared spectroscopy，Raman spectroscopy，ultraviolet-visible spectroscopy, and fluorescence spectroscopy were employed to study the spectral characteristics of five scheelite samples from Xuebaoding in this article in order to clarify the gemological characteristics of scheelite in this area . The typical infrared spectra show that: the fingerprint characteristics absorption in 440 cm-1 and region 800~900 cm-1 is induced by out-of-plane bending vibration andasymmetric stretching vibrations attributed to [WO4]2- tetrahedral groups, respectively. The functional group region (2 000~3 000 cm-1) absorption peaks are related to water. The Raman spectrum scattering main peak at 911 cm-1 corresponds to the ν1 symmetric stretching vibration of [WO4]2-; the Raman shift located in 797 cm-1 is caused by ν3 anti-symmetric stretching vibrations of [WO4]2-; the low intensity Raman scattering peak at 322 and 400 cm-1 correspond to the out-of-plane flexural ν2 vibration of [WO4]2-; The translational mode of (Ca—O) displays the Raman spectrum scattering peak at 211 cm-1. The ultraviolet-visible spectrum shows that the deep orange color of scheelite samples from the Xuebaoding deposit is related to absorption peaks at 584，588，682，743，750，803 and 874 nm. The ultraviolet-visible spectrum may correspond to the “didymium” which is a compound of Pr and Nd. The 3D fluorescence spectra show that colorless scheelite sample and deep orange scheelite samples have the same main fluorescence peak position and number, which is located in λex235 nm/λem455 nm，λex250 nm/λem490 nm andλex265 nm/λem523 nm. In addition to the above-mentioned main fluorescence peaks, the light orange scheelite samples also appear to have a fluorescence peak at λex250 nm/λem425 nm.
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Received: 2022-06-09
Accepted: 2023-06-30
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Corresponding Authors:
CHEN Quan-li
E-mail: chenquanli_0302@163.com
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