On a visit to Tucson, relatives took me to a gem and mineral show where we saw a collection of geodes. Ordinary on the outside; beautiful on the inside. Will you please tell us how they are formed and ...

For just $10, you can be the jewel of the gem show, seated inside an amethyst geode that's 9 feet tall and 6 feet across. Oh, and since it's 6-feet-deep, they can also shut you inside the geode. This ...