Home of the world famous Cave of the Crystal Swords.

This is the cave of giant crystals found in the lead, zinc and silver mine of Naica, Chihuahua, Mexico. These are huge selenite crystals (gypsum) and are the largest crystals of any kind ever discovered (the largest is close to 50 m in length). The "swords" are 300 m down in a limestone host rock.
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