This working lead, silver and zinc mine is filled with incredible selenite crystals that have reached truly surreal proportions: as large as 50 feet long and 4 feet wide. It culminates in Cueva de los Cristales, which contains some of the largest-known crystals anywhere in the world. Scientists here have worked out that its unusual size is due to a happy coincidence of temperature, water and minerals led to approximately six thousand years of steady and continuous crystal growth. While mining operations have now ceased, you can’t sneak in here as the high temperature and humidity underground require special oxygen suits to be worn. It is closed to the public after one hapless individual attempted to steal a crystal and died from the temperature.
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