Obsidian and dacite are both a volcanic rock. Fairly easy to work with, make a sharp but not very durable point. The point above was made of raw Reed Springs flint from northwest Arkansas. Tough stuff, and holds an edge well. In fact that point broke ribs on both sides and was still sharp. I touched up the edge a little, re-halfted it and hunting with it again.
I've killed deer with obsidian, dacite, keokuck, Reed Springs, and Texas flint. All of them worked, but the raw, tough flint out performed the obsidian and cooked rock hands down.