From the Vault: The Invention of the Mirror, Part 1
Stuff To Blow Your Mind
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Obsidian Mirror
obsidian is a glass like volcanic rock formed by the rapid solidification of lava without crystallization. It's found in places that have undergone what's called riolitic eruptions. Humans have been drawn to it since prehistoric times, though depending on where those humans are, they are going to have less or more access to it.
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