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Created page with "== Introduction == Obsidian is a naturally occurring volcanic glass formed as an extrusive igneous rock. It is produced when felsic lava extruded from a volcano cools rapidly with minimal crystal growth. Obsidian is typically found within the margins of rhyolitic lava flows known as obsidian flows, where the chemical composition (high silica content) and rapid cooling inhibit the formation of crystals. This glassy rock is known for its smooth, uniform texture and its sh..."
