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This Mexican Cave of Crystals Holds a Deadly Secret
The Cave of Crystals is home to various crystal formations, mainly made of selenite gypsum. These crystals are known for ...
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Cave of Crystals "Giant Crystal Cave" at Naica – Mexico
The gypsum crystals in the Naica Mine are the largest natural crystals ever found. They can grow up to 36 feet (11 meters) long and weigh up to 55 tons. The cave is located at a depth of 2,300 ...