Posted by: Robert Janssen | September 11, 2012

Naica Giant Crystal Cave in Mexico

The Naica Mine of Chihuahua, Mexico, operated by Industrias Peñoles mining company, is a working mine that is known for its extraordinary crystals.

The chamber holding these crystals is known as the Crystal Cave of Giants, and is approximately 1000 feet down in the limestone host rock of the mine.

The crystals are composed of selenite (gypsum), are as large as 4 feet in diameter, are up to 50 feet long and weigh up to 55 tons.

The crystals were formed by hot hydrothermal fluids saturated in gypsum emanating from the magma chambers deep below.

The cavern was discovered in 2000 when miners were drilling through the Naica fault, which they were worried would flood the mine.


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