I met some one that was making arrow heads with obsidian and when I hound SRP I wondered if any one made razors out of it. Now I no and think it would be cool to make a frame back with it. But I also wonder if after the initial edge wears if it could be honed back to a good edge.
They didn't originally hone the arrow heads or blades from what I understand its all about the way its chipped of the original piece then shaped by breaking the edge off in smaller chips.

And Yeah Jimmy that is pretty cool I would try it but only with a harness. And I'm sure you never used one. Thats the way the Empire States Building was built. You are a Manly man for sure.