That one on the left looks super useful.
this post was submitted on 15 Jun 2024
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Obsidian scalpels are used in medicine successfully, they're ridiculously sharp. I'm not a rockalogist to say it would or wouldn't have been useful tho
They're also very delicate. Not to say obsidian isn't/wasn't used for cutting tools, but afaik they were thicker and just knapped on the edge.
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.
That rock is not obsidian. It doesn't look like flint to me either when I look up images of flint. So, again, looks way too flimsy to be a tool.
It's not like sandstone and granite have the same hardness because they're both rocks.