Iridescent Pyrite from Bulgaria

This beautiful pyrite cluster features numerous crystals with etched faces and an iridescent coating of chalcopyrite. It's a really special piece with absolutely no damage from a hard-to-find locality. It is from Gyudyurska Mine, Madan District, Bulgaria.

It measures approximately 34 x 32 x 29mm and weighs 45.9 grams. The last photo was taken under 20x magnification. Previously part of the George Reimherr Collection.