As such, they are believed to be the purest form of selenite crystal in the world. The Cave of the Crystals, or Cueva de los cristales, as it was dubbed, is a horseshoe-shaped chamber roughly 358 ...

Naica’s Crystals Cave, maybe the most amazing underground wonder on Earth, was discovered by chance inside the deep mine of Naica, in the State of Chihuahua, Mexico. It is a true geode: a cave ...

These massive selenite (gypsum) crystals, some measuring as long as 11 meters and weighing as much as 55 tons, still amaze scientists and adventurers alike. The cave's record-setting conditions ...