CRYSTAL-lw151-lg (IMAGE) Rice University Caption Rice University graduate student Patrick Phelps used cathodoluminescence microscopy to measure the chemical composition of sample crystals. Credit Photo by Linda Welzenbach/Rice University Usage Restrictions Must credit: "Linda Welzenbach/Rice University" 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.