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Orpiment Orpiment has the formulae As2S3 and a relative hardness of 2.

It is a rare mineral usually associated with realgar. Distinguished from sulphur by its perfect cleavage.

The results obtained have been compared with the available isotopic ages of the studied minerals; the compared data are satisfactorily consistent.

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Back-scattered electron images, X-ray elemental mapping of selected elements and EPMA spot analysis of large uraninite grains (both from the basement and the supracrustals) collectively demonstrate that subsequent to the major mineralizing event at ∼1.24–1.20 Ga, the mineralized rocks were subjected to fluid-mediated alteration, which resulted in ∑REE Y- and Si (Ca)-enrichment of existing ∼1.24–1.20 Ga uraninites in the basement and supracrustal rocks, respectively.

We cannot constrain the exact timing of this alteration event.

Olivine Olivine has the formulae (Mg, Fe)2Si O4 and a relative hardness of 7.

The ordinary varieties are common but the precious varieties are quite valuable.

The present study aims to appraise the geochemical and temporal evolution of uranium mineralization from the basement and the adjoining supracrustals in the Samarkiya area integrating textural features, geochemistry, and in situ U-Th-Pb dating of uraninite.

Palladium Palladium is a rare grey-white metal element with the symbo Pd.

It has the power of absorbing a very large amount of hydrogen to which it is permeable when heated.

However, we do not entirely reject the possibility of neo-mineralization.

The discrete events deciphered from uraninite in the Samarkiya area can also be broadly linked to some major magmatic-metamorphic events, identified from other independent studies, in the ADFB.




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