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Copper or brass
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There are copper mines up by you I believe, would suggest it's possible that it's a nugget. If you weren't afraid of changing the look, you can rub vinegar with a cotton cloth on one spot. If it shines up to a red "copper" color I would say yes. If it doesn't shine up so well and looks more goldish yellow, it might be a brass alloy. Any manufacturing near the spot?Central Ohio
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I wouldn't do anything to that. it's a large natural copper nugget. These are placer nuggets, transported to the area by glacial drift. These are the nuggets the people from the Old Copper Culture found and hammered into tools and weapons. Pretty neat to find a copper nugget in it's raw form.
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Called float copper due to being carried by the glaciers and dropped. That might even have some silver in it.Searching the fields of NW Indiana and SW Michigan
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Yup, looks like float copper. Isle Royale in Lake Superior and surrounding areas are one of the few places where essentially pure (or with Silver) copper is found in natural form. Glaciers plowed through there and spread it around.
From there it was carried by Native Americans and heavily used in the Archaic and late Woodland/Mississippian times. Yours might have been carried around, but if it hasn't been hammered on it's hard to tell.Hong Kong, but from Indiana/Florida
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