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Geodes are spherical or oval-shaped rock formations that are typically filled with crystals or mineral matter. They can be found in various locations around the world, but are most commonly found in areas with volcanic or sedimentary rock formations.One of the most famous locations for geode hunting is the deserts of the southwestern United States, specifically in the states of Arizona, California, and Utah. These deserts are home to a type of geode called thundereggs, which are formed from volcanic ash and can be found in the surrounding hills and rocky outcroppings.Another notable location for geode hunting is the state of Iowa in the Midwest United States. The Keokuk area of Iowa is well-known for its geodes, which are formed from sedimentary rock and can be found in the surrounding limestone cliffs and riverbeds.In addition to the United States, geodes can also be found in other parts of the world, such as Mexico, Brazil, and Madagascar. In Mexico, geodes can be found in the state of Chihuahua, specifically in the area around the town of Mapimi. These geodes are known for their large size and the vibrant colors of their crystals.Geodes can also be found in Brazil, specifically in the state of Minas Gerais. These geodes are formed from volcanic rock and are known for their large size and the variety of minerals that they contain.Lastly, geodes can be found in Madagascar, specifically in the area around the town of Andranondambo. These geodes are known for their unique crystal formations and the variety of minerals that they contain.In conclusion, geodes can be found in various locations around the world, but are most commonly found in areas with volcanic or sedimentary rock formations. Some of the most famous locations for geode hunting include the deserts of the southwestern United States, Iowa, Mexico, Brazil, and Madagascar. These unique rock formations can make for an exciting and rewarding hobby for rockhounds and geology enthusiasts.