Sometime real life is more amazing than fiction. Here’s a link to a 2007 article about unbelievably huge crystals discovered in a Mexican cave,1200 feet underground. Just scroll down through the photos, even if you don’t take the time to read the article.
These photo’s might look like a science fiction movie set, but they’re real (to the best of my knowledge).
Wow, this is an amazing planet we live on!