Copper Nugget: Large Float Copper Nugget 13 Lbs 5 Oz. Resembling Bust of Louis XV
A specimen of float copper from the Copper Country of Michigan.
No two pieces of float copper are alike, and this one has interesting features.
When the glaciers came down across the Copper Country tens of thousands of years ago, they picked up pieces of copper and deposited them hundreds of miles away.
Imagine a glacier, one to two miles thick, moving across outcrops and shearing off pieces of copper.
When the glaciers melted, these pieces were tumbled and worn by the melt waters, then eventually buried in the debris.
Float copper is only discovered by chance, by people using metal detectors, or by somebody plowing a trail across a plat of land or excavating to put in a foundation for a building, etc. (it does not come from copper mines); pieces are discovered as far south as Chicago and as far north as Canada, wherever the glaciers existed and moved thousands of years ago.
This float copper specimen is 7 by 7-1/2 inches wide across the widest points, up to 1-1/4 inches thick, and weighs 13 pounds 5 ounces.
Textured surface with crevices left by weathered out quartz, with some weathered quartz still visible, and dirt in the crevices; I think it bears a resemblance to the bust of Louis XVI that was used on his coinage and assignats.