I hunt for petosky stones. And ive been known to pick up other interesting stones. I carry a small one in my pocket. But....i know little about any that Ive collected.
Here's one I found recently
Not that sort of rock
no gosh i hate this new look for the site, can't even see if anyone replies. bring back the old version - it wasn't perfect but it workedreplied
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Not so much, but my wife likes to collect ones from special places.