Fossil, rock or artifact

[vanous101]

Can anyone tell me if this is a rock or fossil? Can't found anything anywhere similar. 3 holes, 1 at each corner all connect in center. Think it's stone unless bone can hardened into stone like consistency.

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[kenstein]

My two cents, leaning to artifact. Do the holes show any signs of being made by man? Can you get close-up of the holes?

 

[bone2stone]

Natural formation.
Once a larger more complex specimen. Softer inside dissolved away when
surrounding matrix washed away leaving this marvelous anomaly.
One very nice abnormal rock.
[Not artifact, not fossil]

It was a "Rock" when you found it on the ground.
You took it home, it is now a "Specimen"

Bone2stone