The BIGGEST CRYSTALS in the world!! Some of them are more than 10 meters long!! They are made of selenite which is a form of gypsum (Spanish: yeso). Its formula is CaSO4.2 H2O.
Cave of the Crystals (from wikipedia)or Giant Crystal Cave (Spanish: Cueva de los Cristales) is a cave in Mexico. The main chamber contains giant selenite crystals, some of the largest natural crystals ever found. The cave's largest crystal found to date is 11 m (36 ft) in length, 4 m (13 ft) in diameter and 55 tons in weight. The cave is extremely hot with air temperatures reaching up to 58 °C (136 °F). The cave is relatively unexplored due to the extreme temperatures and high humidity. Without proper protection people can only endure approximately ten minutes of exposure at a time.
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