These geodes are found underground in the shape of tubes. They were full of gas and the crystals are created from the escaping of the gas and water seeping in to create a chemical reaction that crystalizes. That's the short explanation…I’ve actually been in caves in Minas Gerais in Brazil that were completely covered in amethyst crystals…it was like being inside a geode. Amazing!
Mineral Specimen
20” x 16” x 17” tall
