The macuahuitl was a sword with obsidian blades used mostly by the Aztecs. It was sharp enough to decapitate a man, and even a horse

 

Macuahuitl

 

 

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A macuahuitl, a type of macana, is a wooden sword with obsidian blades. The name is derived from the Nahuatl language. Its sides are embedded with prismatic blades traditionally made from obsidian, famous for producing an edge far sharper than even high-quality steel razor blades. It was a common weapon used by the Aztec military forces and other cultures of central Mexico. It was described during the 16th-century Spanish conquest of the region.