Dims: 2.95x2.80x2.60" (7.5x7.1x6.6cm)
Wt: 14.46 oz (409.2g)
Volga River, Russia
As the mudball that formed this concretion dried and shrank, several internal cracks developed. At some point, these cracks became coated with tiny pyrite crystals, and these developed an irridescent coating. The resulting colors include brassy hues of gold, blue, purple, and red. Under a loupe, the pyrite crystals resolve into tiny intergrown cubes. This is a colorful pyrite specimen.