That's phenomenal Warren! Excellent work by the knapper and I bet that blade is razor sharp. I believe I read a while back that obsidian was used for scalpel blades until fairly recently because they could put a sharper edge on it than steel. Possibly a factoid.
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Jim E.

“If you don’t know where you are going, you might wind up someplace else.” – Yogi Berra

Me 2020