A 12.1-ounce nugget of natural native copper from the glacial drifts of Michigan, polished on one side to show its penny-bright luster, which contrasts nicely with the antique patina in the recessed areas. 8.5 x 5.8 x 3.1 cm.
Attribution: Rob Lavinsky, iRocks.com – CC-BY-SA-3.0
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:: Locality: Ontonagon County, Michigan, USA ([http://www.mindat.org/loc-18498.html Locality at mindat.org])
:: A