本文選題：廣西大化 + 墨玉�。� 參考：《光譜學與光譜分析》2017年07期

【摘要】：近年來大量的墨玉在國內(nèi)外玉石市場上陸續(xù)出現(xiàn),廣西大化墨玉是最新發(fā)現(xiàn)的墨玉新品種。為了探究廣西大化墨玉的礦物學及譜學特征,針對產(chǎn)自廣西大化瑤族自治縣的墨玉樣品進行了常規(guī)檢測,以及采用X射線粉末衍射儀、激光拉曼光譜儀、傅里葉紅外變換光譜儀和激光剝蝕等離子體質(zhì)譜儀等現(xiàn)代譜學儀器測試分析,從礦物組成、拉曼光譜和紅外光譜以及化學元素組成進行了研究分析。常規(guī)寶石學特征測試顯示廣西大化墨玉的折射率為1.64(點測),比重為3.12。偏光顯微鏡觀察顯示廣西大化墨玉的主要礦物為陽起石,含量大于98%,結(jié)構(gòu)為顯微毛氈狀結(jié)構(gòu)。XRD測試明確樣品主要成分為陽起石,其特征面網(wǎng)間距為8.498 3和3.145 9姒。傅里葉紅外變換光譜儀測試結(jié)果顯示樣品的紅外光譜與透閃石理論值接近,主要的特征峰為1 078,1 026,925,765,703,659,584,485,436cm~(-1),其中1 078,1 026,925cm~(-1)為O—Si—O和Si—O—Si的反對稱伸縮振動及O—Si—O對稱伸縮振動,765,703,659cm~(-1)為Si—O—Si對稱伸縮振動,584,485,436cm~(-1)為Si—O彎曲振動。激光拉曼光譜測試測試結(jié)果顯示樣品的圖譜基本集中在3500~3 800和119~1 054cm~(-1)這兩個區(qū)域內(nèi),樣品的拉曼光譜119~1 054cm~(-1)的特征峰中1 055,1 029和930cm~(-1)為閃石類礦物特征的Si—O伸縮振動,744和671cm~(-1)為Si—O—Si伸縮振動,且在671cm~(-1)是強度最大的特征峰位,代表硅氧四面體結(jié)構(gòu)單元中橋氧的對稱伸縮振動;在3 800~3 500cm~(-1)區(qū)間為M—OH伸縮振動區(qū)域,反映了M1和M3位置的陽離子與結(jié)構(gòu)中的OH-成鍵的振動信息,位于3 628,3647,3 664,3 678cm~(-1),這是由于OH-伸縮振動導致。通過激光剝蝕質(zhì)譜儀測試分析發(fā)現(xiàn)樣品的主要化學成分為SiO2(52.4%),FeO(21.95%),CaO(12.5%)和MgO(12.4%)。此外還含有少量Al2O3,MnO,Na2O,P2O5,K2O和TiO2,由于樣品富含F(xiàn)e元素,計算Mg/(Mg+Fe)=0.504,因此大化墨玉為軟玉中的陽起石玉,并由此推斷大化墨玉的黑色由含鐵量較高所致。
[Abstract]:In recent years, a large number of Mo jade in the domestic and foreign jade market, Guangxi Dahua Mo jade is the latest discovery of new varieties of Mo jade. In order to investigate the mineralogical and spectral characteristics of Dahua Moyu in Guangxi, the samples of Moyu from Dahua Yao Autonomous County in Guangxi were routinely detected, and X-ray powder diffractometer and laser Raman spectrometer were used. Modern spectroscopic instruments such as Fourier transform Spectrometer (FTIR) and Laser denudation Plasma Mass Spectrometer (PLMS) were used to study and analyze the mineral composition, Raman spectrum, infrared spectrum and chemical element composition. The conventional gemology characteristic test shows that the refractive index of Guangxi Dahua Moyu is 1.64 (the specific gravity is 3.12). The results of polarizing microscope show that the main mineral of Dahua Moyu in Guangxi is actinite, the content of which is more than 98 and the structure is microfelt structure. XRD test shows that the main component of the sample is actinite, and the characteristic surface network spacing is 8.498 3 and 3.145 9? The results of Fourier transform spectrometer show that the infrared spectrum of the sample is close to the theoretical value of tremolite. The main characteristic peaks are 102692576570365485436cm ~ (-1), in which 1 078U 1 026925 cm ~ (-1) are O-Si-O and Si-O-Si antisymmetric stretching vibration and 765 703659 cm ~ (-1) Si-O-Si symmetric stretching vibration 584485436 cm ~ (-1) is Si-O bending vibration. The results of laser Raman spectroscopy show that the spectra of the samples are mainly concentrated in the regions of 3 800 and 1 19 ~ 1 054 cm ~ (-1). The Raman spectra of the samples are characterized by Si-O-Si stretching oscillations of 1029 and 930 cm ~ (-1), which are characterized by amphibole minerals (744 and 671 cm ~ (-1), and at 671 cm ~ (-1) ~ (-1) are the largest characteristic peaks, respectively, in the characteristic peaks of 119 ~ 1054 cm ~ (-1) ~ (-1) ~ (-1) and 930 cm ~ (-1) ~ (-1) ~ (-1), respectively. Representing the symmetrical stretching vibration of the bridge oxygen in the SiO2 tetrahedron structure unit, the M-OH stretching vibration region is in the region of 3 800 ~ 3 500 cm ~ (-1), which reflects the vibration information of the cations in M1 and M3 positions and the OH- bonding in the structure. It is located at 3 628 / 3647 / 3664 / 3 678 cm ~ (-1), which is caused by OH- stretching vibration. The main chemical compositions of the samples were found to be SiO _ 2 ~ (2 +) ~ (52.4) and MgO ~ (12. 4) by means of laser denudation mass spectrometer. In addition, a small amount of Al _ 2O _ 3-MNO _ 2O _ (Na _ 2O) P _ 2O _ (5) O _ (5) K _ (2) and TIO _ (2). Because the sample is rich in Fe elements, the Mg/(Mg Fe ~ (2 +) is calculated to be 0.504, so Dahua Mo jade is the caterpillar in nephrite, and it is deduced that the black of Dahua Mo jade is caused by the high iron content.
【作者單位】： 中國地質(zhì)大學(武漢)珠寶學院;鄭州信息科技職業(yè)學院;
【基金】：國家自然科學基金項目(41202038) 中央高�；究蒲袠I(yè)務費專項資金基金項目(CUGW090229) 中國地質(zhì)大學實驗技術(shù)研究項目—重點項目(2013—23)資助
【分類號】：P575;P619.28

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