Geodes (Greek γεώδης - ge-ōdēs, "earthlike") are geological secondary structures which occur in certain sedimentary and volcanic rocks. They are themselves of sedimentary origin formed by chemical precipitation. Geodes are essentially hollow, loosely spheroid to oblate masses of mineral matter that may have formed.
Crystal Healing Chart: Crystal Formations and their Meanings. What are the Crystal Healing properties of different crystal formations and shapes? Discover how these common and unusual forms add extra special meanings to your crystals. #crystals #infographic
Rare Large Crystal Opal Mintabie, South Australia, Australia The opal deposits of Mintabie have long been depleted with no new production emerging. The present example was set aside many years ago by the miner who could not bear to part with it earlier. Simply contour polished to reveal its beauty, a vibrant electric green blue pinpoint play-of-color are seen to dance across the surface. Such a notable piece would, no doubt, create a fine pendant.