Secret Ridge Thunderegg with some Curious Structures

Not having seen the actual stone, I am unsure what it going on at the 'bottom' of this stone (in the centre, in the photograph). At first I thought it was damaged, but it lookes more like some 'crazed' growth in there. Curious!

3.75" x 3"

From the collection of Gary Mangan

This thunderegg is for sale. Please email Gary Mangan for details.