Strange find (Septarian, Fossilized Bone, Weird Rock?)

[RockForum]

alright so I found this and thought it was a septarian, Now I'm hearing all sorts of others saying. Its fossilized bone because it appears to have cell structure on it (whatever that means). getting many different opinions now on all sorts of other stuff. What do you think this is? I'm really at a loss and have no clue. Is it fossilized bone? IF its a rock what kind is it? If its a septarian what kind? So many people are saying different things about this and I'd like to know what it is or have a better idea of what this is. Help greatly appreciated

 

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[Charlie P. (NY)]

Does it separate where that crack is? Bone will have internal features whereas a rock may not.

 

[flinthunter]

From the pictures, I would call it a concretion of some sort.