By the way, as of today, the rock I showed you, is worth almost $600. According to a few rock sites that sell puny pieces of obsidian on their web site. I guess if a person were real serious, they could make a pretty penny breaking them up and selling them like some places sell Mt St Helens ash in test tubes.
Every tool I’ve ever found, flint or otherwise is precious to me. Never bought one, never sold one. That is a beautiful stone. If I had found it, it would have made my day.