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Volume 19 Issue 2
Sep.  2021
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ZHOU Zhou, LI Liping. Colour Origin of Green Chalcedony from Taiwan[J]. Journal of Gems & Gemmology, 2017, 19(2): 34-40. DOI: 10.15964/j.cnki.027jgg.2017.02.004
Citation: ZHOU Zhou, LI Liping. Colour Origin of Green Chalcedony from Taiwan[J]. Journal of Gems & Gemmology, 2017, 19(2): 34-40. DOI: 10.15964/j.cnki.027jgg.2017.02.004
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Colour Origin of Green Chalcedony from Taiwan

  • 1. Shaoxing Test Institute of Quality and Technical Supervision, Shaoxing 312000, China;

  • 2. Gemmological Institute, China University of Geosciences, Wuhan 430074, China

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  • Received Date: November 15, 2016
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    • Abstract
  • Chemical compositions and spectral characteristics of green chalcedony from Taiwan, China, were studied with the help of UV-Vis-NIR spectroscopy, EPMA, XRD and IR spectroscopy. The distribution of its colour-causing element and colour-causing mineral were observed by EPMA, and the coloration mechanism of green chalcedony from Taiwan was concluded. The results showed that Cu in the tiny copper mineral chrysocolla causes the green colour. The UV-Vis-NIR spectra showed that the absorption band at 570-800 nm is caused by the2Eg→2T2g spin allowed transitions of Cu2+. EPMA tests showed Cu in green chalcedony from Taiwan distributes unevenly and exists as impurity ion and copper mineral. The result of XRD showed that the copper mineral is chrysocolla. NIR spectrum showed the absorption peaks of chrysocolla and chalcedony, which further confirmed the existence of chrysocolla in green chalcedony from Taiwan.
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    • References (11)
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