Now here is a link you might want to read. Very interesting. About the giant crystal cave, in Naica, Mexico.
What an exciting story. They have to enter the cave with special suits and can only stay 30/50 minutes, depending on the person. Every step they take, must be taken with caution. If not, they could be impaled on crystal.
Check it out. There is so much we don't know about on this wonderful planet, thanks to people like this for sharing their stories.
Till next time, keep looking up.