These 11 color pancam spectra  extracted from five different regions on and
around Bounce Mark rock.  The green and yellow spectra are from the Bright rock
powder and dark rock surface respectively.  These spectra show a drop in
reflectance near one micron, consistent with a less-oxidized iron bearing
silicate such as Olivine or Pyroxene.  These spectra are not inconsistent with
this rock being a basaltic rock.  The relative brightness of the powder
can be explained by particle sizes.

The red spectrum is from the bright dusty soil next to Bounce Mark rock.
The spectrum is dominated by the signature of oxidized
"ferric" iron (Fe3+) like that seen in the classic Martian
dust. The teal spectrum is from the darker Meridiani soils.
That spectrum is also dominated by ferric iron, though the
reflectivity is lower probably because the grains are coarser 
in these soils compared to the dust.

The purple spectrum from the larger granules in the Meridiani soil show a
fine grain iron oxide (Fe3+) component.

Jason Soderblom and Jim Bell


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