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Correct me if I am wrong but i thunk I read that the best finishers come from volcanic ash that settled and slowly got hot with pressure over time. Instead of things like chert which have high heat...

I am not a knapper, but I am a arrow head hunter, and have a very nice collection, which means I speak rock... :)
I live in Northern Oklahoma and we have a popular chert called "Kay County Chert" ...