Native copper is fairly common in some parts of GA and also Mich. Looks like some of the stuff I've seen in the Mich UP except seems to have a lot of quartz in it. Look close you might see some silver hiding in there.
I also agree its native copper. If you can remove some of the matrix for better display it would be sellable, but not big bucks. It's kind of like what the market will bear at any given time.