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Beautiful Cottages Around The World Posted: 13 Mar 2012 11:14 AM PDT

Top 5 Most Amazing Caves In The World Posted: 05 Mar 2012 04:26 AM PST 5. Cave of Crystals (Mexico): world's largest known natural crystals Known as "the Sistine Chapel of crystals," Mexico's Cueva de los Cristales (Cave of Crystals) contains some of the world's largest known natural crystals—translucent beams of gypsum as long as 36 feet (11 meters). The cave is 950 feet (290 meters) underground. The Naica mining complex, which yields lead, zinc, copper, silver, and gold, zigzags nearly half a mile underground (760 meters). Deep inside Naica mountain, the Cave of Crystals is a horseshoe-shaped cavity in limestone rock about 30 feet (10 meters) wide and 90 feet (30 meters) long. Volcanic activity that began about 26 million years ago created Naica mountain and filled it with high-temperature anhydrite gypsum. When magma underneath the mountain cooled and the temperature dropped, the anhydrite began to dissolve. The anhydrite slowly enriched the waters with sulfate and calcium molecules, which for millions of years have been deposited in the caves in the form of huge selenite gypsum crystals.

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