Fool's Gold (IMAGE) University of Wisconsin-Madison Caption This crystal of iron pyrite shows the characteristic cubic crystals of 'fool's gold.' A new study led by Song Jin at the University of Wisconsin-Madison identifies defects in pyrite's crystal structure as a critical obstacle to building commercial solar cells from the cheap and abundant iron pyrite material. Credit University of Wisconsin-Madison Geology Museum Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.