Obsidian: Difference between revisions
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Revision as of 21:08, 19 October 2022
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.
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| This article uses material from the Wikipedia article Obsidian, which is released under the Creative Commons Attribution-ShareAlike 3.0 Unported License (view authors). | 
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