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It's not spooky or supernatural at all, but I do know of this very strange stone. The middle one in pic related.
There's this event in a small West Virginia town that I attend every year. One very specific stream has these round, cracked, and dark stones. They're quite rare even in the stream, but campers in the area have made it an activity to look for them for over half a century. We call them "thunder eggs", but I believe that to be a total misidentification that ended up sticking; if you google "thunder eggs", you will see that the results are these volcanic ash geodes that don't look anything like this one.
Now, the thing is, the people that go to this event are typically well connected and live all over the world. Many people over the years have brought "thunder eggs" to professional geologists and researchers to learn what the hell they actually are and why they have the cracks and such. None of the professionals are able to identify it.
Lots of people have "looked into it" and usually they come up with some bogus theory they aren't able to back with evidence.
It's been itching at me for a long time, when I go back to college I plan to see if an environmental studies professor that specializes in appalachia has any ideas.
