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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.
top most and both lower middle and lower left could be upper middle looks like marble lower left looks like a sandstone
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.