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Study on Relationship between Colour of Crust and that of Interior of Jadeite Jade

LUO Qu-kan,CHEN Bing-hui,WAN Mo-li(Department of Earth Sciences,Sun Yat-sen University,Guangzhou 510275,China)  
Main colour of the crust of jadeite jade includes yellow,white,black,red and so on,which is the secondary colour,whereas other colour called the primary colour often distributes irregularly.The colour of the interior of jadeite jade with dark yellow crust is usually blue-green and sometimes red or yellow,which are mainly coloured by Fe2+/Fe3+ ions.The colour of the interior of jadeite jade with light yellow crust is mainly light purple or sometimes light green,and the content of Fe is lower.The colour of the interior of jadeite jade with white crust is white or colourless,resulting from the lack of colouring elements.The colour of the interior of jadeite jade with black crust includes emerald green,grayish cyan,purple,grayish white or black for various origins.Green and black crust could be direct appearance for judging the distribution characteristics of the interior colour of jadeite jade.
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