I've since found 3 more of these specimens. When scratched gently with a sharpe knife, they give off a silvery shine as if they're metallic. (Hope they aren't uranium ore or something;-) I have yet to find anything exactly like them on the internet. Perhaps they're some sort of metal plated quartz. Some sort of conductor, even? Ancient Aliens, anyone?
Anyway, someone from The Smithsonian is coming to The Aurora Fossil Museum in September. I hope to get them to check out these artifacts.