As with other forms of obsidian, rainbow obsidian is both rock and glass. However, this isn’t the same kind of glass that’s used in your nice new French doors. It’s far more badass ...
It’s typically composed of around 70 percent or more non-crystallized silica, along with a bunch of different trace elements. It appears as a dark glassy rock that’s typically black, although ...
Transforming the brain tissue to glass would have required an extremely hot and fast-moving ash cloud, lab experiments suggest.
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