Study on Color-causing Elements in Qinghai Nephrite by Elemental Analysis and Electron Paramagnetic Resonance Spectroscopy

Hai-yan YU; Qing-feng RUAN; Xin SHA; Yu-fu YANG

doi:10.15898/j.cnki.11-2131/td.201805140130

2019 Vol. 38, No. 3

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Article navigation > Rock and Mineral Analysis > 2019 > 38(3): 288-296

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Hai-yan YU, Qing-feng RUAN, Xin SHA, Yu-fu YANG. Study on Color-causing Elements in Qinghai Nephrite by Elemental Analysis and Electron Paramagnetic Resonance Spectroscopy[J]. Rock and Mineral Analysis, 2019, 38(3): 288-296. doi: 10.15898/j.cnki.11-2131/td.201805140130

Citation:

Hai-yan YU, Qing-feng RUAN, Xin SHA, Yu-fu YANG. Study on Color-causing Elements in Qinghai Nephrite by Elemental Analysis and Electron Paramagnetic Resonance Spectroscopy[J]. Rock and Mineral Analysis, 2019, 38(3): 288-296. doi: 10.15898/j.cnki.11-2131/td.201805140130

Study on Color-causing Elements in Qinghai Nephrite by Elemental Analysis and Electron Paramagnetic Resonance Spectroscopy

1.
College of Earth Sciences, Guilin University of Technology, Guilin 541004, China
2.
Guangxi Key Laboratory of Hidden Metallic Deposits Exploration, Guilin 541004, China

Received Date: 14 May 2018

Revised Date: 23 July 2018

Accepted Date: 09 April 2019

Abstract

Abstract

BACKGROUNDColor 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. OBJECTIVESTo reveal the color-causing elements of eight colors of nephrite from Qinghai based on the relationship between analysis data and hue changes. METHODSX-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. RESULTSThe 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. CONCLUSIONSThis 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.
- Qinghai nephrite /
- Electron Paramagnetic Resonance /
- color-causing elements /
- Fe

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References

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