World’s Largest Crystal Cavs Naica Mine in Mexico and Empress of Uruguay, this is the largest Amethyst Geode

World’s Largest Crystal Cave Naica Mine The spectacular Giant Crystal Cave is connected to the Naica Mine, located in Chihuahua, Mexico. It goes around 300 meters bellow the surface. The main chamber contains the largest selenite crystals ever found, some of them reaching 11 meters in length, 4 meters in diameter and about 55 tons in weight.…