The origin of black colouration in onyx agate from Mali

Author： Götze J.   Nasdala L.   Kempe U.   Libowitzky E.   Rericha A.   Vennemann T.  

Publisher： Mineralogical Society

ISSN： 0026-461X

Source： Mineralogical Magazine, Vol.76, Iss.1, 2012-02, pp. : 115-127

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