The cave of crystals is in Chihuahua Mexico and is connected to the Naica Mines. It houses numerous gigantic crystals. The largest crystal ever found here is 12 metre in length and 4 metre in diameter. The temperature within the cave is extremely hot as a result of which most of it remains unexplored. The mining company’s pumping action keep the cavern clear of water, hence, accessible. The crystals deteriorate in air and so talks are on the way that the cave will eventually be resealed and water level allowed to rise.