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Saturday 31 March 2012

The Cave Of Crystals

The Cave of Crystals


The cave of crystals or Cueva de los Cristales- is an amazing geological formation in Mexico.

This is a cave connected to the Naica mine that sits 300m below the surface.


The main chamber contains giant gypsum crystals.


The largest crystal that has been found to date is 11 m in length and weighs 55 tonnes.


The cave is really hot with 90-99% humidity and it is due to these factors that the cave is as of yet realtivly unexplored as without the proper protection people can only have 10 minutes exposure at any one time.


Formation of the crystals


Naica lies on an ancient fault and there is an underground magma chamber below the cave. The magma heated the ground water and it became saturated with minerals, including large quantities of gypsum. The hollow space of the cave was filled with this mineral-rich hot water and remained filled for about 500,000 years. During this time, the temperature of the water remained very stable at over 50 °C. This allowed crystals to form and grow to immense sizes

 
Discovery

In 1910 miners discovered a cavern beneath the Naica mine workings, the Cave of Swords (Spanish: Cueva de las Espadas). It is located at a depth of 120 m, above the Cave of Crystals, and contains spectacular, smaller (1 m long) crystals. It is speculated that at this level, transition temperatures may have fallen much more rapidly, leading to an end in the growth of the crystals.


The Giant Crystal cave was discovered in 2000 by miners excavating a new tunnel for the Industrias Peñoles mining company located in Naica, Mexico, while drilling through the Naica fault, which they were concerned would flood the mine. The mining complex in Naica contains substantial deposits of silver, zinc and lead.


The Cave of Crystals is a horseshoe-shaped cavity in limestone rock. Its floor is covered with perfectly-faceted crystalline blocks. Huge crystal beams jut out from both the blocks and the floor. The caves are accessible today because the mining company's pumping operations keep them clear of water. If the pumping were stopped, the caves would again be submerged. The crystals deteriorate in air, so the Naica Project is attempting to visually document the crystals before they deteriorate further.


A further chamber was found in a drilling project in 2009. The new cave, named the Ice Palace, is 150 m deep and is not flooded, but its crystal formations are much smaller, with small 'cauliflower' formations and fine, threadlike crystals

Exploration hinted at the existence of further chambers, but further exploration would have required demolition of the crystals. It was stated that the cave would eventually be resealed and the water level allowed to rise again.

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