I recently came across a uraninite grain as inclusion within pyrite. While studying the elemental (U,Fe, S, Si) x-ray images by EPMA, it is observed that there is silica enrichment in parts of uraninite leading to coffinitisation. Simultaneously, some parts of pyrite grain show lesser Fe, S and higher Si. Since it is quite clear that the minerals were affected by a silica rich solution as evidenced by coffinitisation, what could be the end product in the patches where pyrite is affected? If anyone has come across similar features, kindly share your views.
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