This is the crystal cave of giants found in the Naica Mine, Chihuahua, Mexico. These are Selenite crystals (gypsum) and are the largest crystals ever discovered...  They are 1000 feet down in a limestone host rock, where they are mining for lead, zinc and silver.

This is the crystal cave of giants found in the Naica Mine, Chihuahua, Mexico. These are Selenite crystals (gypsum) and are the largest crystals ever discovered... They are 1000 feet down in a limestone host rock, where they are mining for lead, zinc and silver.

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