“非洲独龙玉”的矿物成分及谱学特征

doi:10.3964/j.issn.1000-0593(2024)06-1676-08

Abstract
References
Related Citation (15)

Download: PDF (22385 KB)
Export: BibTeX | EndNote (RIS)

Abstract In recent years, a novel variety of jade known as “African Dulong Jade” has emerged in the jewelry market of Western Yunnan. It possesses a distinctive, vibrant green hue adorned with intricate veins and feathery patterns, juxtaposed against a colorless greyish-white matrix, occasionally tinged with reddish-brown tones. Notably, its quality surpasses that of the “Dulong Jade” found in the Nujiang Prefecture Yunnan Province, exhibiting promising market expansion prospects.However, the gemological characteristics and mineral species of this jade remain mysterious.To shed light on this subject, this research explores the mineral composition, structural characteristics, chemical components, spectral attributes, and the origin of its captivating color. Employing advanced analytical instruments such as the Infrared spectrometer, Raman spectrometer, X-ray powder diffractometer, Scanning electron microscope, Energy dispersive spectroscopy, X-ray fluorescence spectrometer, and Ultraviolet-visible spectrometer, the study delves into a comprehensive investigation.The infrared spectrum examination reveals that the green portion of the jade exhibits mixed infrared spectrum characteristics akin to both muscovite and quartz. Notably, infrared absorption peaks at 3 623, 1 080, 694 and 1 619 cm^-1 signify the presence of muscovite. Raman spectra demonstrate that the matrix component of the jade corresponds to α-quartz, as evidenced by characteristic peaks observed at 204, 262, 355, 395 and 463 cm^-1. Conversely, the green section of the jade displays muscovite characteristics with peaks highlighting at 261, 395, 694 and 3 623 cm^-1. Furthermore, the metallic luster observed on the surface of the mineral signifies the presence of pyrite, with characteristic peaks at 343, 379, and 437 cm^-1. Locally disseminated orange-yellow to reddish-brown minerals are identified as hematite, exhibiting characteristic peaks at 224, 295, 409, 493 and 610 cm^-1. X-ray powder diffraction analysis confirms the existence of 2M1 muscovite with discernible diffraction peaks observed at 3.489, 2.981 and 2.563 Å. Insights obtained from scanning electron microscope and energy spectrum scanning elucidate that muscovite manifests as columnar and scale-like aggregates, featuring individual particle lengths ranging from 25 to 40 μm and widths of 2 to 4 μm. Additionally, gersdorffite, an impurity mineral, exhibits minimal content and particle sizes of approximately 10 to 15 μm. Within gersdorffite, iron (Fe) and cobalt (Co) elements partially replace nickel (Ni) through isomorphism. Moreover, the greater concentration of arsenic (As) compared to sulfur (S) suggests a high-temperature hydrothermal deposition origin.Through chemical composition analysis and ultraviolet-visible spectra examination, it is ascertained that the chromogenic mineral muscovite contains barium (Ba) and chromium (Cr), while iron (Fe) is lacking in the quartz matrix. Furthermore, the content of Ba exceeds that of Cr, which acts as the chromic element within muscovite. Beyond color characteristics, this study reveals distinguishing chromogenic elements, chemical composition, and impurity minerals between “African Dulong Jade” and “Dulong Jade” from NujiangPrefecture Yunnan Province using various spectral techniques.These findings serve as compelling evidence for differentiating the two “Dulong Jade” types and contribute to an enhanced understanding of the component information and spectral characteristics of naturally occurring green quartzite jades. Consequently, it establishes a foundation for future inquiries into the metallogenesis geological background and geographical origin tractability of “African Dulong Jade”.

Key words：“African Dulong Jade”;Mineral compositon;Gersdorffite;Color origin;Spectroscopic characteristic

Received: 2023-04-22 Accepted: 2023-11-23

ZTFLH:

P575

Cite this article:

YU Lian-gang,ZHENG Jin-yu. Study on Mineral Composition and Spectroscopy Characteristics of “African Dulong Jade”[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2024, 44(06): 1676-1683.

URL:

https://www.gpxygpfx.com/EN/10.3964/j.issn.1000-0593(2024)06-1676-08 OR https://www.gpxygpfx.com/EN/Y2024/V44/I06/1676

[1] YU Lian-gang（余炼钢）. Journal of Gems &Gemmology（宝石和宝石学杂志），2022，24(3)：20.
[2] CHEN Xiao-ming，CHEN Tao，YAN Xue-jun，et al（陈晓明，陈涛，严雪俊，等）. Journal of Gems & Gemmology（宝石和宝石学杂志），2014，16(2)：47.
[3] CHEN Tao，HAN Wen，LI Tian，et al（陈涛，韩文，李甜，等）. Earth Science—Journal of China University of Geosciences（地球科学—中国地质大学学报），2012，37(5)：981.
[4] WEN Luo（闻辂）. Mineral Infrared Spectroscopy（矿物红外光谱学）. Chongqing：Chongqing University Press（重庆：重庆大学出版社），1989. 140.
[5] Farmer V C. Infrared Spectra of Minerals. Beijing：Science and Technology Press，1982. 85.
[6] ZHOU Dan-yi，CHEN Hua，LU Tai-jin，et al（周丹怡，陈华，陆太进，等）. Rock and Mineral Analysis（岩矿测试），2015，34（6）：652.
[7] JIA Jian-ye，ZHU Zi-zun，PAN Zhao-lu，et al（贾建业，朱自尊，潘兆橹，等）.Earth Science—Journal of China University of Geosciences（地球科学—中国地质大学学报），1997，22(6)：565.
[8] CHEN Qian，CHEN Tao，XU Hang，et al（陈倩，陈涛，徐行，等）. Journal of Gems & Gemmology（宝石和宝石学杂志），2020，22（5）：31.
[9] CAO Shu-hui，ZHANG Li-fei，SUN Qiang，et al（曹淑慧，张立飞，孙樯，等）. Acta Petrologica et Mineralogica（岩石矿物学杂志），2006，25(1)：73.
[10] WANG Pu，PAN Zhao-lu，WENG Bao-ling，et al（王濮，潘兆橹，翁宝玲，等）. Systematic Mineralogy（系统矿物学）. Beijing：Geological Publishing House（北京：地质出版社），1987. 351.
[11] ZHAO Shan-rong，BIAN Qiu-juan，WANG Qin-yan（赵珊茸，边秋娟，王勤燕）. Crystallography and Mineralogy（结晶学及矿物学）. Beijing：Higher Education Press（北京：高等教育出版社），2009. 302.
[12] YU Xiao-jin，CHEN Ke-qiao，ZHANG Li-yan（於晓晋，陈克樵，张丽彦）. Rock and Mineral Analysis（岩矿测试），1997，(3)：54.
[13] ZENG Guang-ce，ZHU Yun-hai，YE De-long（曾广策，朱云海，叶德隆）. Crystal Optics and Photomineralogy（晶体光学及光性矿物学）. Wuhan：China University of Geosciences Press（武汉：中国地质大学出版社），2017. 205.
[14] Rossman G R，Aines R D. American Mineralogist，1991，(76)：1163.
[15] LIU Cui-hong，CHEN Chao-yang，SHAO Tian，et al（刘翠红，陈超洋，邵天，等）. Spectroscopy and Spectral Analysis（光谱学与光谱分析），2020，40(7)：2148.
[16] ZHANG Yong，WEI Ran，KE Jie，etal（张勇，魏然，柯捷，等）. Acta Petrologica et Mineralogica（岩石矿物学杂志），2016，35(1)：139.