2.25" Iridescent Rainbow Pyrite on Septarian - Russia

This is a gorgeous cluster of druzy pyrite on a piece of septarian concretion, collected near Ulyanovsk Oblast, Russia. These concretions occur in clays that have undergone shrinkage, causing cracks at their centers following dehydration. Septarian concretions often contain calcite, though in some cases they can contain pyrite. The iridescence of the pyrite is natural, only adding to the beauty of this stunning specimen.

The entire specimen is 2.25" wide.