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My uncle showed me a piece of obsidian he found near Mount St. Helens
He said, 'This rock is frozen lightning,' and explained how the volcano's heat made it glass. It felt so smooth and sharp at the same time. Has anyone else found volcanic glass around there?
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jason_stone596mo ago
Your uncle's description is actually pretty spot on for how obsidian forms.
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terryscott6mo ago
Actually, that's a cool story but I have to disagree a bit. Obsidian isn't really "frozen lightning." That's fulgurite, which is glass made from lightning hitting sand. Obsidian is just volcanic glass that cooled super fast. Still a really neat find though.
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