Dragonglass is real, even if white walkers (hopefully) aren’t


Obsidian dragonglass Game of Thrones

Megapixels: 'Game of Thrones' turns a naturally-occurring glass into a fantastical weapon.

Obsidian forms as lava, spewed from a volcano, quickly cools at surface temperatures. It’s found all over the planet, including in the fantastical series Game of Thrones,
via Popular Science "http://bit.ly/2PcZePj"

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