just want opinions on this.

[RockinIdaho]

 

[quito]

Looks like possibly worked, but for sure, it's Broke,

 

[chase2]

Hard to tell from the pic's, but it looks like granite. My guess is your looking at natural fractures.

 

[monsterrack]

The second photo , top right makes it look like it is worked stone. The odds of nature making a flake pattern like that, that even is hard to see.

 

[danasaur]

I agree with minsterrack, second photo looks like piece is flaked. Problem is that it is really thick. Possibly some type of tool.

 

[RockinIdaho]

It isnt thick. It tapers to the edges. I thought maybe a knife.