Counting Critical Metals (IMAGE) DOE/Sandia National Laboratories Caption Sandia National Laboratories intern Kadie Marie Mei Sanchez works on a mass spectrometer used for quantifying the concentration of metals, such as the rare-earth elements separated by the tailored MOFs. Credit Photo by Craig Fritz/Sandia National Laboratories Usage Restrictions Non-commercial and news usage with credit License Original 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.