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Native Copper-bearing Conglomerate

As North America's rift failed, sulfur-poor solutions percolated through its rocks, taking copper from basalt and depositing it in overlying sediments.

Group: Sedimentary
Catalog Number: 18731
Locality: Calumet and Hecla mine, Calumet , Michigan

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