Geodes are formed in sedimentary rock. Essentially, geodes are sparkly crystals. Geodes could also be found in different types of gemstone. According to ancient folklore traditions, geodes are considered objects of great healing power.
From healing Perspective geodes provide clarify of thought making them good meditation tools. It helps you to be more clear in your mind, letting go of those thoughts that can get in the way of meditation. In fact, geodes enhance your meditation which allows you to get deeper insight in the form of different pieces of information, or flashes that come through you that can help you in your life.
These stones are also considered tools of creativity which can help you boost creative thought.
Maybe you are stuck on a project, if you hold the geode and close your eyes and think about where you have been stuck, you could get a flash of insight on where to move forward in the project.
Overall, Geode is a great stone to boost creativity, imagination, open up clarity of thought, enhance meditation in that way.