Tags: Chemical Substance, Mineral.

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 minimum crystal growth. Obsidian is commonly found within the margins of rhyolitic lava flows known as obsidian flows where the chemical composition (high silica content) induces a high viscosity and polymerization degree of the lava.

Lipari-Obsidienne_(5).jpg

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