Why do geodes have crystals inside?

So, let's start at the beginning: how do you get a hollow rock with lots of sparkling crystals inside? First you need a hollow rock. Geodes start their lives as a hollow bubble inside a layer of rock. read more

All Geodes Are Not Created Equal The first one is quite hollow but for a nice layer of medium-sized blue crystals. These dugway geodes have bands of blue and pink. The geode at the left and the one at the top of the page are both dugways from Utah. The colors come from the different minerals that flowed through the bubble so many millions of years ago. read more

Crystals inside geodes will vary in color for a number of reasons. The solutions inside a vug may consist of varying concentrations of different mineral solutions. The mineral crystals that form from these solutions may have a specific color associated with them, such as malachite (green), azurite (blue) or rhodoschrosite (pinkish-red). read more

With geodes a pocket forms within a stone during the growing process. Then a mineral fills the inside of the pocket. The mineral forms into little crystals due to the heating process that takes place within the earth. read more