Rock that looks like bone

[Essex]

I was digging for Indian artifacts at a friends place several years back and pulled this out. I have recently found treasure net and after reading a few post figure it wouldn't hurt anything to ask about this item.
It's definitely hard as rock but looks like bone.

Any ideas?

 

[villagenut]

Looks like a weathered shard from a big sea shell to me.

 

[Essex]

I had not thought of something like that. It was on top of a hill near a lake. I don't know of any shells in the lake apart from small muscle shells but who knows. Thanks

 

[kcm]

It "does" look a lot like bone. Have heard of fossilized bone before, but have never actually seen any.

 

[old digger]

I also believe that it is a piece of an old shell.

 

[digger460]

Was in St. Croix last year, and saw 1000's of what you pictured here. Voting on worn shell!

 

[Essex]

I really appreciate everyone's comments. It'll be a mystery as to how it got in North Georgia, but maybe it was brought in by Indians