Copper - FCU36.5
Michigan Float Copper, Keweenaw Peninsula
10.5" / 36.5 lbs
During the last ice age, ca. 10,000 years ago, glaciers scraped the Upper Peninsula of Michigan freeing this copper nugget from the bedrock. The copper was dragged, or “floated”, within the ice sheet along with other rocks, gravel and sand. The long period of burial since the cessation of glacial movements oxidized the surface copper. The resulting oxidation products are primarily malachite (a green copper carbonate) and cuprite (a red copper oxide). I polished portions of the surface and coated this colorful specimen with a thin coat of lacquer to prevent oxidation.
I call this one Isle Royale.
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