Post by Admin on Feb 6, 2024 11:30:08 GMT -7
The difference between Geodes and Thundereggs
Geodes are formed by Gas bubbles rising through Liquid Basalt or Andesite. Basalt is fine grained and has a smooth surface. Andesite has larger crystals in it, and therefore a rough surface.
Thundereggs are formed by Cristobalite growing crystals in High Silica Magma chambers and being expelled to the surface. The release of pressure allows the trapped gas to expand.
