I finally had some time to work some of the Rhyolite Madcrow sent me. He called it a "box of pain and discomfort" Oh yea I had no Idea.
This was my first time working rhyolite and I have made a lot of rubble. After several failed attempts I finally got a few.
1st 2 picks are the small points I made.
3rd pic is the larger bi-face I was almost done thinning and you can guess what happened.