Geode rock is a type of sedimentary and volcanic rock that is hollow, vaguely circular rock, in which masses of mineral matter (which may include crystals) are sequestered.

Imagine walking through a dusty, arid landscape when you stumble upon a seemingly ordinary rock. Its rough exterior might not catch the eye, but what lies within surely will. Geodes are one of ...

The results are beautiful geodes such as those you saw in Tucson. Geodes are fairly common in Arizona, especially at Diamond Point near Payson and in volcanic fields around Flagstaff.

Geode is a Vintian from the planet Vint. As a Vintian name can't be pronounced correctly unless you don't have a mouth, the humanoid crew of The Vessel gave the space-rock a nickname: Geode.