An extremely fine Pyrite crystal group showing rare iron-cross twinning from the Wyoming Mine in Colorado. This interpenetrate twin is a brassy, lustrous, sharply formed, loose floater Pyrite group composed of a pair of pyritohedrons. There are even a few, much smaller pyritohedrons that are twinned with respect to the two larger twinned crystals. It is complete all around with no damage or points of attachment.