Fractured glass—naturally occurring volcanic obsidian in this case—is second only to diamond in sharpness. These were among the first knives ever made, yet even today obsidian scalpels are used in some surgeries because they are sharper than steel (though more delicate). This is a modern reproduction of a stone knife of the type made by pretty much every early human society that had access to obsidian.
Location: Box U110
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