Cave of Crystals “Giant Crystal Cave” at Naica, Mexico 

Discovered by chance, the secret Mexican crystal caves big enough to drive a car through

The Naica Mine of the Mexican state of Chihuahua, is a working mine that is best known for its extraordinary selenite crystals. Located in Naica in the municipality of Saucillo, the Naica Mine is a lead, zinc and silver mine operated by Industrias 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.  […]

Read article here:   https://www.geologyin.com/2014/11/the-huge-cave-mines-at-naica-mexico.html

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