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Went to a reptile shows and bought some rocks.
(thelemmy.club)
Said that they are petrified wood. I guess they look like it. $5
Thinking about cutting and polishing them. Then put them in some walking sticks I'm making.
I looked it up a bit, and they can be filled with a bunch of different minerals. I don't really know much about them, though. They all do have a kind of high pitched sound when tapped together. If that means much.