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Spectroscopic and crystallographic analysis of nephrite jade gemstone using laser induced breakdown spectroscopy,
Rameez Abbas Khan1, M Anwar-Ul-Haq1, M Qasim1
1Department of Physics, University of Sargodha, Sargodha, Pakistan.
Calibration-free laser-induced breakdown spectroscopy (CF-LIBS) accurately determined nephrite jade
Area of Science:
- Geochemistry
- Materials Science
- Analytical Chemistry
Background:
- Nephrite jade's unique properties necessitate precise characterization.
- Understanding its elemental and structural composition is crucial for various applications.
Purpose of the Study:
- To comprehensively analyze the elemental composition, mineral phases, and crystalline structure of nephrite jade.
- To validate the accuracy of calibration-free laser-induced breakdown spectroscopy (CF-LIBS) for jade analysis.
Main Methods:
- Utilized calibration-free laser-induced breakdown spectroscopy (CF-LIBS) for elemental analysis.
- Employed Raman spectroscopy to identify molecular vibrations.
- Applied X-ray diffraction (XRD) to determine crystalline structure.
Main Results:
- CF-LIBS identified key elements (Si, Mg, Ca, Li, Fe, Al, Na, K, Ni) with high accuracy post-correction.
- Raman spectroscopy revealed Si-O and M-OH stretching vibrations.
- XRD confirmed the monoclinic crystalline phase of tremolite.
Conclusions:
- CF-LIBS, after self-absorption correction, provides quantitative elemental data comparable to ICP-OES for nephrite jade.
- Integrated spectroscopic and diffraction methods offer a robust approach for comprehensive jade characterization.
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