| 1600407btrmlin.is ((COPPER natural sheet)) , $15 MINIMUM BID, White Pine Mine, Ontonagon County, Michigan, 18.5 x 15.5 x .5 cm, Cabinet | |
 | Here is a large sheet Copper formed in cracks in massive rock. This one was clean to make it lustrous. This is one of the many forms of Copper in nature. |
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