Obsidian

Obsidian tools from Tilkitepe, Turkey, 5th millennium BC.

Obsidian is a naturally occurring volcanic glass formed when lava extruded from a volcano cools rapidly with minimal crystal growth. It is hard, brittle, and amorphous, and it is an igneous rock. Obsidian has been used to craft cutting and piercing tools.

See also

• Chisel
• Knife
• Spear

References

This article uses material from the Wikipedia article Obsidian, which is released under the Creative Commons Attribution-ShareAlike 3.0 Unported License (view authors).