Trancas Geodes with Quartz, Chalcedony and Calcite
Size Range: 63 mm - 70 mm  
Total Weight: 762 grams 
Origin : Trancas, Chihuahua, Mexico
These unique Geodes are found inside hard Rhyolite boulders in the heart of Chihuahua, Mexico. The Trancas Geodes are special for their incredible crystal formations and their fluorescence under a short-wave UV light. They are from the Cenozoic Era in the Tertiary Period  making them ~37 million years old.