Sardinian Ichnusaite (IMAGE) Terry Collins Assoc Caption Ichnusaite exemplifies a mineral rarity -- created through a subterranean mash-up of the radioactive element thorium and lead-like molybdenum, with only one specimen ever found, in Sardinia. High-res: http://bit.ly/1NUniMX Credit American Mineralogist / Paulo Biagioni 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.