That one on the left looks super useful.
this post was submitted on 15 Jun 2024
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Obsidian is a very special rock made under special circumstances. When I hear someone say "made of rock" I think of rocks I would find anywhere and not obsidian.
So yeah rock based knives are useful but if you only include common rock types I imagine they would probably suck or have to be sharpened constantly.
Flint is what's used and it was everywhere. Even made some as a kid when we were bored.