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Witwatersrand Conglomerate

This rock contains tiny sedimentary particles of gold, uraninite, and pyrite. Such ores can no longer form. Higher levels of oxygen in today's atmosphere would alter the uraninite and pyrite particles before they could be deposited.

Group: Sedimentary
Catalog Number: 97715
Time Period: 2.3 billion years old
Locality: Crown mines, Johannesburg, South Africa , South Africa

     2080

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Smithsonian National Museum of Natural History Department of Mineral Sciences website Credits