Obsidian rock is of course – Google, Google – a naturally occurring volcanic glass formed as an extrusive igneous rock.
Of course it is! And Obsidian is produced when felsic lava extruded from a volcano cools rapidly with minimal crystal growth.
We only mention this because watching this chap break one open is an oddly satisfying watch. Like, really satisfying.
Breaking open an Obsidian rock from r/oddlysatisfying
And here are a few of the comments it prompted on Reddit.
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