Cave of Crystals

This video from a cavern in Naica, Mexico is of some huge gypsum and selenite crystals. Workers in a silver mine opened up the cavern a few years back, accidentally. This cavern is deep within the earth, so the temperature is over 100 F, and the suits that they wear are full of ice. An interview with the host and some more information about the crystals is on BBC's website here:http://news.bbc.co.uk/2/hi/science/nature/8466493.stm