Iron Sulfide crystal (IMAGE) University of Minnesota Caption This image shows an example of a crystal of iron sulfide grown in the University of Minnesota lab to extremely high purity using a method called chemical vapor transport. Note the "goldish" sheen, which is characteristic of pyrite, or fool's gold. Credit Leighton et al 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.