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Obsidian is a naturally occurring volcanic glass that forms when molten lava cools rapidly. It is known for its smooth, shiny appearance and sharp edges.
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Flint: A type of hard stone used by early humans to make tools and weapons.
Pumice: A light-colored volcanic rock with lots of air pockets, often used as an abrasive material.
Another type of volcanic rock that is commonly found in oceanic crust and has a dark color similar to obsidian.