Quick link (because your parents are here):
This is a cave in Mexico with the larges crystals found anywhere in the world. These selenite crystals grew over a half-million year period and only recently were discovered when a mine broke through the wall to find these. They are big enough to walk on. The cave itself has a temperature of over 150 degrees F and a high humidity - without special environment suits, people have died in under fifteen minutes.
Check it out.
This is a cave in Mexico with the larges crystals found anywhere in the world. These selenite crystals grew over a half-million year period and only recently were discovered when a mine broke through the wall to find these. They are big enough to walk on. The cave itself has a temperature of over 150 degrees F and a high humidity - without special environment suits, people have died in under fifteen minutes.
Check it out.
