In addition to these two geodes, many massive amethyst geodes have been found in Uruguay. Depending on how you want to measure size either one could be considered the largest. There are two geodes that lay claim to be the world largest, a massive, 35 foot across Celestite geode in Ohio and the 30 foot long, selenite crystal lined, Pulpi Geode in Spain. Vugs are irregularly shaped pockets typically along of vein or breccia while geodes are rounded or oblong in shape. Geodes are hollow cavities within the rock, while nodules are completely filled in with minerals. What Is The Difference Between A Geode, Nodule & Vug? The area near Chihuahua, Mexico produce abundant geodes called Coconut Geodes mined from about 100 feet below the surface.The volcanic rock deposits in Southern Brazil and Uruguay which produce gorgeous and sometimes very large amethyst geodes.The Warsaw Formation in the Keokuk region near the area where Missouri, Iowa, and Illinois.Geodes have been found in volcanic rock world wide, but some of the most prolific deposits include: Geodes found at the same locality typically have similar minerals deposited inside.
By far the most abundant mineral found within geodes is macrocrystalline quartz (including amethyst), but calcite, pyrite, barite, celestite, & chalcedony ( agate) are also frequently found. Over millions of years, hydrothermal fluids or groundwater deposited minerals within these hollow cavities forming a crystal lining. They often form in air bubbles which became trapped in volcanic rock as it cooled, or inside voids left in sedimentary rocks. Geodes are hollow, often spherical cavities within rocks that are lined with crystals and other minerals.
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