Magnetic properties,characteristic spectra and colors of turquoise |
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| Authors: | Huifen Zhang Chuanyi Lin Zhongwei Ma Zhenguo Yang Enlin Zhang |
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| Institution: | 1. Institute of Geochemistry, Academia Sinica, Chaina
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| Abstract: | The unique bright bluish-green color of turquoise as a high-grade jade has long received wide attention. The relationship between the color of turquoise and its composition and structure is described in this paper on the basis of chemical data, EPR, magnetic susceptibility, absorption and Mössbauer spectra. The results show that the basic color of turquoise (bright blue) is related to the existence of octahedrally on the amount of iron. EPR, magnetic susceblue through green to earth-yellow is dependentcoordinated Cu2+ and the shade variation from ptibility, and crystal-field spectra of Cu2+ have been analyzed and compared with the theoretical calculations. A preliminary discussion is also made of the color change as a function of temperature. |
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