That would be a fun one for me to break Wade
I think you're right about the heat thing. Some of that you sent me seems a little over cooked, almost too brittle. Then some of it was juuust right. I think it had to do with the condition of the rock before hand.
I also noticed the areas within the rock that I've beat on that had a good bit more gloss, was the areas that seemed like it had been over heated.
It's pretty good rock, but I think it has a lot of inconsistency from rock to rock.
Still fun to whoop on though
Good luck with that piece.