The Naica Mine of the Mexican state of Chihuahua is a working mine that is best known for its extraordinary selenitecrystals. Located in Naica in the municipality of Saucillo, the Naica Mine is a lead, zinc and silver mine operated byIndustrias Peñoles, Mexico's largest lead producer.[] Caverns discovered during mining operations contain crystals of selenite (gypsum) as large as 4 feet (1.2 m) in diameter and 50 feet (15 m) long.
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