Huge Classic Killer Green Thunderegg with Crystal

This is an almost archetypal Killer Green thunderegg except for its size, which is unusually large. The result is a really dramatic stone. Most of the interior is water-clear quartz, but there is an inner 'layer' of quartz crystals with the faintest of faint ghosts of amethyst.

5 1/2" by 4 1/2" by 2 3/8"