These caves have temperatures of over 113 degrees Fahrenheit and 90% humidity - fatal to humans after 30 minutes but necessary to form these giant crystals.
Click below to read additional information and see more pictures on the crystal caves. There is a documentary on the Crystal Caves on Thursday at 9PM on the National Geographic channel.
http://news.nationalgeographic.com/news/2007/04/photogalleries/giant-crystals-cave/index.html
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