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Crystal Cave
Naica Cave of Chihuahua, Mexico.
Naica - it mines lead, zinc and silver, which have been found in large voids containing crystals selenite (gypsum). In this cave are the largest natural crystals ever found: translucent gypsum beams length of 36 feet (11 meters) and weighing up to 55 tons. Located at a depth of a thousand feet (300 meters), the cave was discovered by two miners digging up a new tunnel for Industrias Penoles company in 2000.
