Trancas Geodes, 50 lb lot Books Between 12 mm and 20

Between 12 mm and 20 mm long

white banding

formed through felsic lava that rapidly cools after exploding past the earth’s crust

mahogany obsidian

Trancas Geodes, 50 lb lot Books Between 12 mm and 20Trancas Geodes from Mexico. These geodes have a darker gray and tan exterior with a translucent to light blue interior. They can have a variety of crystal shapes inside, including fine druzy, large crystals, needle like crystals, or they can be almost solidly filled with chalcedony. Some can fluoresce green under short wave UV light due to trace uranium content. Size can range from a few inches to fist size. Approximately 60 pieces per 50 lb lot.