Facilities Physical Petrology Lab: Johnson Hall 321. Equipped with computers, printers, whiteboard, journals, petrographic microscope, and plenty of space to work. Where the serious business goes down. Electron Microprobe Lab: Johnson Hall 424. We have regular access to the ESS Department’s Electron Microprobe (EMP), a 1986-vintage JEOL733 equipped with EDS and WDS capabilities. We routinely obtain robust major- and minor- elemental concentrations, backscatter electron images, secondary electron images, and high-quality photographs of samples. The EMP Lab also houses a state-of-the-art carbon-coater. The ESS EMP is maintained by Scott Kuehner, who always seems happy to answer questions and provide solutions to analytical problems. Mass Spectrometry: Johnson Hall 402A/305A. The Physical Petrology Group has access to two mass spectrometers, both of which may be equipped with our portable laser. The Finnigan-Sola quadrupole provides trace element data from laser-ablation inductively-coupled-plasma mass-spectrometry (LA-ICP-MS), while the ____________ multi-collector provides high-precision trace element data from a wider range of analytes. Mineral Separation/Petrology Lab: Johnson Hall 422. Mineral separation via heavy liquids and mineral picking in preparation for chemical analysis is performed routinely. Plagioclase and zircon are most commonly separated and picked by PhysPet members, but the lab is also set up to deal with many additional phases. Mineral picking may also be performed in the Clean Lab (Johnson 402E), where access to HF for mineral dissolution is also available. Specimen Preparation Lab: Johnson Hall 039A. Maintained by our Building Coordinator, Dave McDougall. This is where rocks are cut, crushed, washed, and ground to start sample production. Dave will also prepare thin sections if asked nicely (and repeatedly)! Epoxy mounts for EMP and ICP-MS microanalytical work are prepared and polished here, too. Matthes: Johnson Hall 039. Our computing powerhouse is a 10-node (20 cores) Linux-Beowulf cluster housed in the ESS server room. Below: The real Matthes Crest (5.7) in the Cathedral Range of the Sierra Nevada, CA.