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《Journal of Gems & Gemmology》 2009-01
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Preliminary Study on Gemmological Characteristics and Genesis of Andesine from Guyang,Inner Mongolia

DONG Xin-zhi1,QI Li-jian2,ZHONG Zeng-qiu1(1.Faculty of Earth Sciences,China University of Geosciences,Wuhan 430074,China;2.Tongji University,Shanghai 200092,China)  
The chemical compositions and mineral structures of the placer type gem-quality andesine samples from Guyang County,Inner Mongolia,are preliminarily studied by using the XRD,EPMA,LA-ICP-MS.The results show that the unit cell parameters of the andesine samples from Guyang are: ao=0.816 7 nm,bo=1.2811nm,co=0.7109nm,α=93°43′,β=116°16′,γ=89°58′.The chemical formulas of the two representative samples(G-1,G-2) are respectively K0.03Na0.51Ca0.44Al1.39Si2.60O8 and K0.03Na0.50Ca0.45Al1.40Si2.59O8,and the end-member fomulas are respectively Ab52An45Or3 and Ab51An46Or3,where the Eu is positive anomalies and the light rare earth elements are more enriched than the heavy rare earth elements.Through the Δ2θ(131-131)=1.91,the order degree is 0.5 and the formation temperature is about 700℃ of the samples,which indicates that the andesine samples from Guyang may come from the volcanic or plutonic environment with medium-high temperature.
【CateGory Index】: P619.28
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