The biggest crystals in the world

I’ve included a picture with ED’s tiny hand. Now want
to see something astounding? Check out this website:
http://www.ironammonite.com/2009/12/surviving-cueva-de-los-cristales-giant.html

In a cave in Mexico where the temperatures soar to
50 Celsius/122 Fahrenheit, there are gypsum crystals that
make a grown man look like ED’s small fingernails!

You can also check out the National Geographic website:
http://ngm.nationalgeographic.com/2008/11/crystal-giants/crystals-photography

I found even the story of how they entered the cave
(without perishing) and how the caves were found
(water tables sunk so low, the caves were drained
of water) fascinating.