If you have been to a crystal store or a natural science museum with a gift shop, you might have seen stones that you can buy called “ Apache tears”. Obsidian is also a reasonably popular gemstone featured in different jewelry pieces. It creates cleaner cuts and causes less damage to the surrounding tissue than almost any other blade we are able to fabricate. This delicate and incredibly sharp nature of obsidian is therefore sometimes used for scalpel blades by surgeons. A standard household razor blade has a fineness measurement of between 300 to 600 angstroms, and an obsidian blade, in contrast, has a measurement of just 30 angstroms. Today, some knives are still made with obsidian blades because the cutting edge can be almost five times sharper than highly refined steel.
