There are some CU-ul rocks at a state park called copper falls state park in wisconsin. I went there as a kid and found a smoothed rock from the water that turned out to be a break off from a very large copper vein further up the river. What makes it cool is that copper is heavier than most "smooth pebbles" so it took an exceptionally long time to migrate down the river, and had not quite made it to the falls yet, where I found it in all its green-gray glory at the age of 8. 24 years later I still have it. I am rather blessed to live in Wisconsin, go north of the Wisconsin River and you can go wild rock hounding for copper...heck...if you know where to look you'll find more copper doing that than you would scrapping for it. (Shhh that's a secret). WI still let's you purchase mineral rights to old mines where you can pretty much find copper veins all day every day, just below the top soil.
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