Geodes are rock formations shaped like spheres with a mineral-lined hollow in the center and an outer layer of more resistant material.

The geode survives as the surrounding bedrock erodes, with a sparkling druse of small quartz crystals and several bands of translucent gray and white agate usually found lining its cavity. Many are lined with additional magnificent items—often including large chunks of amethyst or citrine crystal that have broken off from adjacent portions surrounding them

The Public's Addiction to Geodes

Geodes are popular among geologists. The general public, on the other hand, adores them. They are delighted and astounded that an ordinary rock can hold a lovely cluster of gemmy crystals, a colorful lining of banded agate, or both in the same hollow. People who have never taken a geology course buy thousands of tons of geodes each year, broken open or sawn and polished. They purchase them because they like them. They adore little geodes for jewelry, sawn and polished geodes for bookends, and stunning amethyst geodes for home or office decor.

There's something special about discovering a beautiful treasure hidden within a rock that appears completely ordinary from the outside.