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mexico's cave of giant crystals. outstanding. PBS did a special on these crystals. They are huge.

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The Giant Crystal Cave in Mexico under Naica Mountain.

Crystal Cave Mexico share on facebook | The Giant Crystal Cave in Mexico under Naica Mountain.

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The cave of crystals in Naica mountain at the Chihuahuan Desert - Mexico's Cave of Crystals contains some of the world's largest known natural crystals—translucent beams of gypsum as long as 36 feet (11 meters). A new study says the gems reached their vast sizes thanks to a peculiar combination of consistent volcanic heat and a rich watery mixture.

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