Have you ever seen a Geode before?
But do you really know what it is though? I found out yesterday that geodes are geological, that they are formed from sedimentary and volcanic rocks.
They are rock cavities with crystal formations (The inside, with time and space the crystals form) and/or concentric banding. (the rings of color around the inside)
The exterior is usually lime stone or related rock with quarts crystals or chalcedony deposits. They are really incredible and enjoyable rocks to have. But how are they formed? Where are they formed?