The Cave of Crystal , Mexico 

Its actually a cave which is connected to Naica Mine. Its 980 ft below from the surface. The crystal atom is 
gypsum.The biggest crystal that is found in the cave is 12 meters in length. Its a splendid beauty of nature.It weights for 55 tons. The Cave is extremely hot  with a higher percentage of humidity.

cave of crystal

Below the cave, there situated an underground magma chamber.It heated the ground water. and it became saturated with minerals including large quantities of gypsum.