Found something interesting in thrift store?

[Wonder.]

So i found this rock in the thrift store, im not really sure what it is

 

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[Deftone]

I would guess a geode slice. Welcome to the forum.

 

[RustyGold]

Geode. Welcome to TreasureNet. Good luck!

 

[ToddsPoint]

Looks like a Brazilian agate slice. I have a few. Gary

 

[GoldieLocks]

The white crystalline inside of this thunder egg is likely quartz.