I know how sharp these minerals can be, but we tend to overlook things we "Know". I cut myself 3 times just sorting the Obsidian today, even before I bought it. I ended up getting a 5 pound chunk of Black Obsidian and a 5 pound chunk of Mahogany. Is there a designated place that you knap to avoid tiny glass shards being everywhere? How do you handle cleanup? The previous owner of my home had a metal shop in the garage, even after scrubbing down the whole place, and living here over a year I still end up with metal slivers in my feet. I suppose I'll have to break down and wear shoes while working this stuff. Any tips will be greatly appreciated. Thanks