MER MARS MOESSBAUER RELATIVE FE
                                     ABUNDANCE V1.0
The Moessbauer spectrometers on the two Mars Exploration Rovers identified Fe-bearing phases and measured the  relative abundance of Fe (percentage of total Fe) according to  oxidation state(e.g., Fe2+ and Fe3+), coordination state (e.g.,  octahedrally coordinated), and specific Fe-bearing phases (e.g.,  percentage of …