Agree with others. Has a cool shape. When I hunt I take home quite a few flakes and put in a jar. I would put that one in my jar for sure. Nothing more big ole discarded piece of nice material.
I see no signs of being worked. Not sure how long you have been hunting artifacts but don't get caught up in the "it fits my hand" criteria, that is not a sign of an artifact, that is a sign of the wonder of the human hand.
By the way, welcome to TreasureNet, the oldest treasure hunting website on the net.
When I first started looking for artifacts, i swore I saw TONS of things out there. Lucilky i was with someone that was skilled and pretty much shot me down everytime.
When i actually found a REAL piece, it made the other finds so obvious they were natural.