Géode

Géode is a French term referring to a geode, which is a geological rock formation that has a hollow cavity lined with crystals. These cavities are typically spherical or ellipsoidal and form within igneous or sedimentary rocks. The process of geode formation begins when a void or bubble forms within the rock. This void can be created by trapped gas bubbles in lava, dissolved organic matter, or the dissolution of mineral nodules. Over time, mineral-rich groundwater seeps into the cavity. As the water evaporates or its chemical composition changes, minerals precipitate out and begin to crystallize on the inner walls of the cavity. Common minerals found in geodes include quartz, amethyst, calcite, and agate. The type of crystal depends on the specific mineral content of the groundwater and the surrounding rock. Geodes are often discovered when the outer rock layer erodes away, revealing the crystalline interior. They can be found in various locations worldwide and are popular among collectors and mineral enthusiasts for their beautiful crystalline structures.