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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.

Usage

See Special:Whatlinkshere/Etymology:Obsidian for a list of articles using this term.

All Creation
This is an etymology page: a page detailing the origins of terminology used in the series in regards to real world culture and history.
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