Rock found in Middle TN 24 July 2024

[Kacsmar]

Hello all, Just joined the site to help identify this rock I found in Middle TN yesterday. Very interesting on the inside, it looks like little octagons of blue on the inside. Thanks to all in advance and thank you for any help. Cheers

25 July update. I've included photos of the rock as a whoe. Both dry photos as well as wet. Thanks all.

 

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[opalboy]

Guessing wildly, the cell structure looks like dino bone.

 

[ToddsPoint]

That’s coral. The little circles are polyps. I’ve never heard of coral coming from TN. What county did you find it in?

 

[E-Trac-Ohio]

Cool find !

 

[Kacsmar]

That’s coral. The little circles are polyps. I’ve never heard of coral coming from TN. What county did you find it in?

this was found in Williamson County.