Please help me identify my new rock find!?

[Maintr88]

I was cleaning up a property and found this rock (along with some others) around the base of a tree in the front yard.

Does anyone know what type of rock this is? It was already cut as you can see in the photos.

The brown is an odd shade i haven’t seen before. Maybe an agate? View attachment 1881760

Thank you in advance for your help.

 

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[Al D]

Geode, but not fully formed

 

[DDancer]

Look up Thunder Egg