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Crystal Cave
 Crystal Cave MexicoThe Crystal Cave of Giants was accidentally discovered in 2000 by miners working in the silver and lead mine at Naica in Mexico. It lies almost 300 meters below the surface of the Earth and it contains the largest crystals known in the world, by far. The largest crystals are over 11 meters long and weigh 55 tons. |  Cave of the Crystals MexicoThe Cave of Crystals is a horseshoe-shaped cavity in limestone. It's 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. |  CrystalThe crystals themselves are made of selenite which is crystallized gypsum, the same material used in drywall construction. Except these crystals formed over a span of about half a million years in a hot water solution, saturated with minerals. The temperature inside the cave remained very consistently hot for the entire time the crystals were growing. |
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