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广西大化和贵州罗甸软玉的谱学特征及产地示踪研究
引用本文:江翠,彭帆,王文薇,尹作为. 广西大化和贵州罗甸软玉的谱学特征及产地示踪研究[J]. 光谱学与光谱分析, 2021, 41(4): 1294-1299. DOI: 10.3964/j.issn.1000-0593(2021)04-1294-06
作者姓名:江翠  彭帆  王文薇  尹作为
作者单位:中国地质大学(武汉)珠宝学院,湖北 武汉 430074;中国科学院上海硅酸盐研究所,上海 200050;中国地质大学(武汉)珠宝学院,湖北 武汉 430074;滇西应用技术大学珠宝学院,云南 腾冲 679100
基金项目:国家自然科学基金项目(41973032);湖北省珠宝工程技术研究中心科研项目(CIGTXM-03-202001);云南省高校宝石及材料工艺工程研究中心(ZX20200201)资助。
摘    要:广西大化和贵州罗甸软玉是近年来我国南方具有一定开采规模的软玉品种,两个产地的软玉矿地理位置较接近,软玉品种既有相似性也有差异.为了对比研究两个产地的软玉品种的光谱学特征及颜色成因,针对产自广西大化和贵州罗甸的玉石样品进行了宝石学常规测试、傅里叶变换红外光谱、激光拉曼光谱和激光剥蚀等离子体质谱等现代谱学仪器测试.研究发现...

关 键 词:大化  罗甸  软玉  谱学特征  产地示踪(溯源)
收稿时间:2020-10-22

Comparative Study on Spectroscopic Characteristics and Coloration Mechanism of Nephrite From Dahua and Luodian
JIANG Cui,PENG Fan,WANG Wen-wei,YIN Zuo-wei. Comparative Study on Spectroscopic Characteristics and Coloration Mechanism of Nephrite From Dahua and Luodian[J]. Spectroscopy and Spectral Analysis, 2021, 41(4): 1294-1299. DOI: 10.3964/j.issn.1000-0593(2021)04-1294-06
Authors:JIANG Cui  PENG Fan  WANG Wen-wei  YIN Zuo-wei
Affiliation:1. Gemmological Institute, China University of Geosciences (Wuhan), Wuhan 430074, China2. Jewelry School, West Yunnan University of Applied Sciences, Tengchong 679100, China3. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
Abstract:Nephrites from Dahua Yao Autonomous County,Guangxi Zhuang Autonomous Region and nephrites from Luodian County,Guizhou province have formed mining scales,both of which have many similar and different characteristics in gemology,spectroscopy and mineralogy.In recent years,a large number of nephrites from these two localities began to appear at domestic and foreign markets.In order to analyze spectroscopic characteristics and color-causing mechanisms of nephrites from these two different sources,the standard gemological methods including refractive index testing,hydrostatic specific gravity testing,an observation by the naked eye and gem microscope were used to their research gemological properties of them.Also,Fourier transforms infrared spectroscopy(FTIR),laser Raman spectroscopy and laser ablation inductively coupled plasma mass spectrometry(LA-ICP-MS)was also used to research spectral characteristics and chemical composition of these nephrites.The research result shows that the infrared spectrum of samples from Dahua County showed main absorption bands at 1033,932,771,699,524,490 and 427 cm-1,and Fourier transform infrared spectrum of Luodian nephrites samples mainly showed absorption bands at 1032,932,773,700,525,490 and 426 cm-1.Infrared absorption bands at 1033,1032 and 932 cm-1are induced by O—Si—O anti-symmetric stretching vibration,O—Si—O symmetric stretching vibration and Si—O—Si anti-symmetric stretching vibration.Infrared absorption bands at 773,771,700 and 699 cm-1are induced by Si—O—Si symmetric stretching vibration.Infrared absorption bands at 525,524,490,427 and 426 cm-1are induced by Si—O bending vibration and M—O lattice vibration.Unlike previous studies,the absorption band at 850 cm-1is first discovered in Dahua nephrites,which may be attributed to minor amounts of diopside pyroxene in the sample.This absorption band has not been reported in the previous studies on Dahua nephrites.According to results of laser ablation inductively coupled plasma mass spectrometry(LA-ICP-MS),the main chemical compositions of nephrites samples from Dahua are SiO2(58.91%),MgO(25.77%)and CaO(13.67%).The main chemical compositions of Luodian nephrites samples are SiO2(57.07%),MgO(24.85%)and CaO(17%).The average content of calcium in Luodian nephrites samples is a little higher than that of Dahua nephrites samples.A spot of FeO,MnO,Al2O3,Na2O,K2O,P2O5and TiO2were also found in our samples.The value of Mg/Mg+Fe is 97.3%in Dahua and 98.8%in Luodian nephrites respectively.This means the main mineral composition of both location nephrites is tremolite.According to our research,Dahua nephrites and Luodian nephrites have different green color-causing mechanisms.Testing results of laser ablation inductively coupled plasma mass spectrometry(LA-ICP-MS)showed that the content of vanadium in Luodian nephrites samples increased with the green deepening,which showed that the color-causing ion of Luodian green nephrites is probably vanadium(V).This article discussed the green color-causing mechanism of Dahua nephrites for the first time.We think that chrome(Cr)and ion(Fe)are color-causing ions of Dahua nephrites because the content of chrome(Cr)and ion(Fe)increased with green deepening.The trace element values can be used to identify the location of the two site nephrites from Dahua and Luodian.Identifying a location tree can be used to distinguish all the known sites of nephrite in China now.
Keywords:Dahua  Luodian  Nephrite  Spectral characteristics  Trac to the source
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