Hi all, I have been suggested to run an XPS / ESCA analysis on a new mineral to have an independent evaluation of oxidation states of elements inside. Of course... material is very scarce and before sacrificing more crystals it would be great if I could use a grain I already probed for preliminary SEM-EDS work. It is a 30 um crystal mounted on graphite gel and coated with evaporated graphite. Is there anyone familiar with this technique? Could crystal size and coating be an issue for analysis?