Unusual Rock

[Derek Sands]

I found this strange looking rock near a river in East Tennessee and I was wondering if anyone could help me identify it.

[MSC]

That is unusual, I have collected rocks, minerals, meteorites for a long time, I have no idea, almost a geode like formation.   

[2Valen]

That is not a rock! I believe you have found a bone of some type of animal. You could take it to either a vet to confirm what I am saying or even to a museum that might have dino bones.

That is not a rock.

[Derek Sands]

Yes it's heavy for it's size

[Derek Sands]

2Valen thank you I wondered about that

[Lacky]

It definitely looks like a spinal collum vertebra. If it's heavy it could be petrified.

[DDancer]

Not a fossil in my opinion.  It appears to be either a geode or a nodule of quartz that surrounded a softer material thats since eroded out of it similar to a concretion.  In the second picture there appears to be banding like that of agate's and some crystal formation towards the center.  A slab cut off the open face and a light polish would make the internal structure stand out and help identification.