Coin Shape

looking for a stone / rock / help please.?
Hi guys Im looking for those rocks that when they are opened are very pretty inside. Also Im assuming its the same thing but its like instead of cracking them open they are cut into coin shapes so they are very smooth….. lol anyways just would love to know the name and if the cut ones vs. the cracked open ones have dif names Id like both.
they are called geodes. you can find them at lapidary supply stores. they are a prehistoric mud ball that has petrified. unopened ones can be cheap because untill they are cut, you don’t know what will be in them. I have seen them with solid agate inside and with crystals.
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