Examination of a calcium sulfate vein called “Diyogha” by the Chemical and Camera (ChemCam) instrument on NASA’s Curiosity Mars rover found boron, sodium and chlorine.

At left, an image from Curiosity’s Mast Camera (Mastcam) shows the context of the pale vein in mudstone of the Murray formation on lower Mount Sharp. A red outline marks the area included in a magnified view, at right, from ChemCam’s remote micro-imager. The magnified view is annotated with indicators of boron, sodium and chlorine content detected by ChemCam at individual points hit with the instrument’s laser.