Study on Color-causing Elements in Qinghai Nephrite by Elemental Analysis and Electron Paramagnetic Resonance Spectroscopy
BACKGROUND Color is the important manifestation of nephrite value. Qinghai nephrite has different colors, but there is a lack of research on coloration. In recent years, the study on the coloration of nephrite in Qinghai mainly focused on azure-green and blue-violet, and it was considered that Cr3+...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Science Press, PR China
2019-05-01
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| Series: | Yankuang ceshi |
| Subjects: | |
| Online Access: | http://www.ykcs.ac.cn/en/article/doi/10.15898/j.cnki.11-2131/td.201805140130 |
| _version_ | 1797953775811428352 |
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| author | YU Hai-yan RUAN Qing-feng SHA Xin YANG Yu-fu |
| author_facet | YU Hai-yan RUAN Qing-feng SHA Xin YANG Yu-fu |
| author_sort | YU Hai-yan |
| collection | DOAJ |
| description | BACKGROUND Color is the important manifestation of nephrite value. Qinghai nephrite has different colors, but there is a lack of research on coloration. In recent years, the study on the coloration of nephrite in Qinghai mainly focused on azure-green and blue-violet, and it was considered that Cr3+ and Mn2+ were respective coloration elements of azure-green and blue-violet. The color of Qinghai nephrite is not a simple color, such as white-green, azure-green, and blue-violet. Therefore, Qinghai nephrite should contain a variety of color-causing elements. OBJECTIVES To reveal the color-causing elements of eight colors of nephrite from Qinghai based on the relationship between analysis data and hue changes. METHODS X-ray Fluorescence Spectrometry (XRF), Chemical Titration, Inductively Coupled Plasma-Mass Spectrometry (ICP-MS) and Electron Paramagnetic Resonance Spectroscopy (EPR) were used to study the color-causing elements of nephrite. RESULTS The color-causing element of white Qinghai nephrite was Fe3+. The color-causing elements of white-green and azure-green Qinghai nephrite were Fe2+ and Fe3+, respectively. The chromogenic elements of green Qinghai nephrite were Fe2+, Fe3+ and Mn in high valence. The color-causing elements of azure-green Qinghai nephrite were Fe2+, Fe3+ and Cr3+. The chromogenic elements of yellow and brown Qinghai nephrite were Fe3+ and high-valence Mn. Fe3+ and Ti4+ were the color-causing elements of blue-purple Qinghai nephrite. CONCLUSIONS This study determined the color-causing elements of different colors of Qinghai nephrite, which provided a theoretical basis for the study of the coloration mechanism of Qinghai nephrite. |
| first_indexed | 2024-04-10T23:07:27Z |
| format | Article |
| id | doaj.art-0bcb2d6164c4432c805306987188c654 |
| institution | Directory Open Access Journal |
| issn | 0254-5357 |
| language | English |
| last_indexed | 2024-04-10T23:07:27Z |
| publishDate | 2019-05-01 |
| publisher | Science Press, PR China |
| record_format | Article |
| series | Yankuang ceshi |
| spelling | doaj.art-0bcb2d6164c4432c805306987188c6542023-01-13T10:06:13ZengScience Press, PR ChinaYankuang ceshi0254-53572019-05-0138328829610.15898/j.cnki.11-2131/td.201805140130ykcs-38-3-288Study on Color-causing Elements in Qinghai Nephrite by Elemental Analysis and Electron Paramagnetic Resonance SpectroscopyYU Hai-yan0RUAN Qing-feng1SHA Xin2YANG Yu-fu3College of Earth Sciences, Guilin University of Technology, Guilin 541004, ChinaCollege of Earth Sciences, Guilin University of Technology, Guilin 541004, ChinaCollege of Earth Sciences, Guilin University of Technology, Guilin 541004, ChinaCollege of Earth Sciences, Guilin University of Technology, Guilin 541004, ChinaBACKGROUND Color is the important manifestation of nephrite value. Qinghai nephrite has different colors, but there is a lack of research on coloration. In recent years, the study on the coloration of nephrite in Qinghai mainly focused on azure-green and blue-violet, and it was considered that Cr3+ and Mn2+ were respective coloration elements of azure-green and blue-violet. The color of Qinghai nephrite is not a simple color, such as white-green, azure-green, and blue-violet. Therefore, Qinghai nephrite should contain a variety of color-causing elements. OBJECTIVES To reveal the color-causing elements of eight colors of nephrite from Qinghai based on the relationship between analysis data and hue changes. METHODS X-ray Fluorescence Spectrometry (XRF), Chemical Titration, Inductively Coupled Plasma-Mass Spectrometry (ICP-MS) and Electron Paramagnetic Resonance Spectroscopy (EPR) were used to study the color-causing elements of nephrite. RESULTS The color-causing element of white Qinghai nephrite was Fe3+. The color-causing elements of white-green and azure-green Qinghai nephrite were Fe2+ and Fe3+, respectively. The chromogenic elements of green Qinghai nephrite were Fe2+, Fe3+ and Mn in high valence. The color-causing elements of azure-green Qinghai nephrite were Fe2+, Fe3+ and Cr3+. The chromogenic elements of yellow and brown Qinghai nephrite were Fe3+ and high-valence Mn. Fe3+ and Ti4+ were the color-causing elements of blue-purple Qinghai nephrite. CONCLUSIONS This study determined the color-causing elements of different colors of Qinghai nephrite, which provided a theoretical basis for the study of the coloration mechanism of Qinghai nephrite.http://www.ykcs.ac.cn/en/article/doi/10.15898/j.cnki.11-2131/td.201805140130qinghai nephriteelectron paramagnetic resonancecolor-causing elementsfe |
| spellingShingle | YU Hai-yan RUAN Qing-feng SHA Xin YANG Yu-fu Study on Color-causing Elements in Qinghai Nephrite by Elemental Analysis and Electron Paramagnetic Resonance Spectroscopy Yankuang ceshi qinghai nephrite electron paramagnetic resonance color-causing elements fe |
| title | Study on Color-causing Elements in Qinghai Nephrite by Elemental Analysis and Electron Paramagnetic Resonance Spectroscopy |
| title_full | Study on Color-causing Elements in Qinghai Nephrite by Elemental Analysis and Electron Paramagnetic Resonance Spectroscopy |
| title_fullStr | Study on Color-causing Elements in Qinghai Nephrite by Elemental Analysis and Electron Paramagnetic Resonance Spectroscopy |
| title_full_unstemmed | Study on Color-causing Elements in Qinghai Nephrite by Elemental Analysis and Electron Paramagnetic Resonance Spectroscopy |
| title_short | Study on Color-causing Elements in Qinghai Nephrite by Elemental Analysis and Electron Paramagnetic Resonance Spectroscopy |
| title_sort | study on color causing elements in qinghai nephrite by elemental analysis and electron paramagnetic resonance spectroscopy |
| topic | qinghai nephrite electron paramagnetic resonance color-causing elements fe |
| url | http://www.ykcs.ac.cn/en/article/doi/10.15898/j.cnki.11-2131/td.201805140130 |
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