Geodes

Geodes are generally defined as spherical rocks containing a cavity. About 6-8 million years ago volcanic activity in the vicinity of Dugway, Utah deposited rhyolite,an igneous rock. Geodes formed when trapped gasses created cavities in the rhyolite.

Ground water circulation allowed minerals to precipitate into the cavities creating spherical geodes lined with quartz in various colors.

Rough geodes, escavated from areas near the Dugway Proving Grounds in Utah.

Geodes are cut in half by a diamond saw and then polished.

Natural Stone Art

of the American West