Great amethyst geode with agate eye of the best quality in a metal stand

An amethyst geode from Brazil with dark crystals of excellent brilliance and a striking agate eye on the front. The rim shows fine rock crystal, framed by a narrow brown agate layer.

The agate eye formed as a closed concentric mineralization within the geode and interrupts the typical internal geode surface with its own banding. Such structures are documented special cases of cavity filling.

The back consists of original basalt, the volcanic host rock of the approximately 100-million-year-old gas bubble. A small crystallized indentation in the basalt is a geological detail. The geode can be removed from the robust metal stand.