In my completely unexpert opinion, it is a natural, not man made stone artifact.
However, I have on one occasion made a discodial knife (breaking a flake of a rounded rock which makes a disc shaped flake) from a piece of sandstone, and it did result in a very sharp edge that would cut. The edge quickly broke up and you couldn't really re-flake it to sharpen it. Pretty lousy material for a blade, but if you had nothing else you could skin a rabbit or cut down a small sapling in a pinch, but it would be useless after that one task.
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