A Macuahuitl is an Aztec weapon that was a wooden club with several embedded obsidian blades. It was a thick, three- or four-foot wooden club spiked with a number of blades made from obsidian. Obsidian is a naturally occurring volcanic glass formed as an extrusive igneous rock. Obsidian is produced when felsic lava extruded from a volcano cools rapidly with minimal crystal growth. Obsidian is capable of producing an extremely sharp edge, sharper than high quality steel razor blades.
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