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《Geological Science and Technology Information》 2006-02
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Relation Between Labradorescence and Internal Structure of Labradorite

XIE Hao,PEI Jing-cheng,LI Li-ping(Gemmological Institute,China University of Geosciences,Wuhan 430074,China)  
This paper lucubrates labradorescence effect with TEM and mineral thin sections.The result indicates that labradorescence is an interference phenomenon due to the Bggild intergrowth lamellar.Only when thickness of the lamellar is between 128 nm and 252 nm,the labradorescence effect is visible.As the intergrowth lamellar is not absolutely parallel and the surface is not absolutely smooth,the interference color is not single.To display the effect better,cutting direction ought to be consistent with the direction of the intergrowth lamellar.Iridescent color is influenced by thickness and ratio between the two groups of lamellar.The thicker the lamellar is,the longer the wavelength of iridescent color is;and the bigger the ratio is,the longer the wavelength of iridescent color is.In addition,this paper also establishes the internal structure model of labradorite according to the result.
【CateGory Index】: P578.968
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Chinese Journal Full-text Database 3 Hits
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1 PENG Yan-ju1,2,HE Xue-mei1,2,FANG Qin-fang1(1.National Laboratory of Mineral Materials,China University of Geosciences,Beijing 100083,China;2.School of Gemmology,China University of Geosciences,Beijing 100083,China);Review on Origin of Iridescence in Gems[J];Journal of Gems & Gemmology;2008-01
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