Jim theres just something about that rhyolite than is addictive, even if it is hard. I find myself trying to go through some of mine even though I have "good" rock. My spalling isnt great, I need to run get some more and make good spalls out of it so it's easier to work. Nasty spalls arent as easy to clean up and work with that stuff as it is with most any other material in the US