What is this brown/black rock?

[acombustiblelemon]

I bought this from a metaphysical store about a year ago and I've completely forgotten what it is. Any ideas?

 

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[EricTheCat]

Could it be a polished thunder egg maybe containing pyrite? That's just a wild guess I really can't help much. Whatever it is that is an incredible piece. Thanks for sharing.

 

[austin]

Think maybe it's polished agate...

 

[kcm]

It IS beautiful!! Whatever the price, was most likely a bargain!