fossil or modern bone?

[hndmarshall]

is this a fossilized bone? it appears to be but am on the fence. Found in gravel from the Brazos river here just west of Houston Texas.

[Rockwood]

If one were to construct a line graph of the situation assigning age to one axis and mineralization potential of the deposition environment to the other, specimens that plot near the center of the graph will always be hard to evaluate.

That said, have you tried a tap test on it ? Or the old burn trick maybe ?