Geodes are small agate nodules with a crystalline interior. They form as cavities inside hardened volcanic or sedimentary rock, when groundwater minerals seep in to grow crystals.
Agate tones and strengthens body and mind, as well as imparting a sense of strength and courage. It enhances creativity and stimulates the intellect. Agate is calming and soothing, and can dispel feelings of jealousy.