Found this at Life in the Fast Lane -- very cool.
Buried 1000 feet below the Naica mountain in the Chihuahuan Desert, Mexico’s Cueva de los Cristales — known as the Crystal Cave of Giants — is a magnificent natural wonder of the largest crystals of selenite (gypsum) on Earth, up to 4 feet in diameter and 50 feet long, weighing as much as 55 tons. Two miners excavating a new tunnel through the Naica fault made the spectacular discovery in 2000.
Read the whole article -- many more pictures.
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