By Nikki Boatright
Geodes are found throughout the world. Some of the most beautiful geodes are found in South America. In the United States they can be found mostly in Iowa. In 1967, Iowa designated the geode as the official state rock, and it has a Geode State Park. Geodes can also be found in Missouri, Arizona, Utah, Nevada, Illinois, Kentucky and California. Deserts and volcanic areas are good places to find geodes.
The word “geode” means “earthlike” in Greek, pertaining to their spherical shape. Geodes are rock on the outside but can have many different types of crystals on the inside. Geodes are round or egg shaped. They can range from a couple of inches to several feet long; in fact, the largest geode ever found was discovered by Javier Garcia-Guinea in an old silver mine in Almeria, Spain in 2000 and was 26 feet long and 6 feet wide and was filled with gypsum prisms.
Geodes are formed in the hollow cavities of soil or rock. This cavity can form in several ways - by a gas bubble in volcanic lava; by limestone being dissolved; by an acidic substance; or by a shell created by dissolved minerals that seep into a hollow area not being filled completely with sediment when it is fossilized. When water seeps into these cavities, the minerals can form crystals, depending on the temperature, pressure, and the amount of water. Minerals will continue to form on the inside walls of the shell, growing towards the center. Each geode is different. Some geodes will have large colorful crystals or solid bands of quartz, and others will have mineral deposits but no crystals formed yet.
It can take millions of years for the hollow space in a geode to be filled and sometimes they remain partly hollow. Geodes that seem light for their size are more likely to be hollow in the center and have crystal formations; these geodes are the most sought after. A geode which is completely filled with crystals is called a nodule. Agate-filled nodules are called “Thunder eggs”. Geode crystals are different depending on the location in which they are formed. Geodes can contain many different crystals; the type of crystal is determined by the kinds of minerals in the water that seeps into the air pockets.
Geodes have a very special energy. Most geodes contain either Quartz or Calcite, but can also contain Amethyst, Jasper, Chalcedony, Pyrite, Sphalerite, Hematite, Kaolinite, Ankerite, Aragonite, Dolomite or black Calcite (which is very rare). Geodes can help with communication with divine beings. They can help boost moods, balance and screen energy, relieve stress and can aid in meditation. They can help with decision making before a situation gets too difficult, and can also enhance astral travel. The healing properties of geodes include treatment of the nervous system, hands and lungs.
Geodes depict beauty and induce remembrance. They are beneficial to health because their beauty inspires well-being and spirituality.
I have several geodes in my personal collection, none of which I have broken open. I think they are beautiful as is and love the mystery and wonderment as to what's inside of them.