The listing, ~~1;GEODE FROM MEXICO has ended.
. The exterior of most geodes generally consists of Chalcedony, a cryptocrystalline form of quartz. Inside the Chalcedony shell many minerals have been found such as Calcite, Pyrite, Kaolinite, Sphalerite, Millerite, Barite, Dolomite, Limonite, Smithsonite, and Quartz, which is by far the most common and abundant mineral found in geodes. Geodes are found mostly in basaltic lavas and Limestones of the Warsaw formation