Enhydro agates are nodules, agates, or geodes with water trapped inside its cavity. Geodes and geode slices are sometimes dyed with artificial colors. Geodes are common around Geode State Park in Henry County. Most geodes contain clear quartz crystals, while others have purple amethyst crystals. Celestine crystals are found in some geodes. "Brazilian agate" is found as sizable geodes of layered nodules. Other minerals and rocks that are prevalent near Delta include obsidian, opal, and geodes. Among them natural crystals, geodes, druses and other kinds of mineral treasures. Eberron shards are found buried in shallow soil in clusters encased in geodes. He enjoys making furniture and sculptures out of geodes, petrified wood, and glass bottles. Geodes can be found in the older Mississippian outcroppings along the Mississippi River. It most commonly is found as small white "cotton ball" formations within basalt geodes. Vugs, cavities and geodes are all examples of open-space filling phenomena in hydrothermal systems. Samples of geodes with unusual colors or highly unlikely formations have usually been synthetically altered. Occasional geodes of celestine can be found next to some of them.