  We report on the design, operation, and data analysis methods employed on the
VNIR imaging spectrometer instrument that was part of the Mars Astrobiology
Research and Technology Experiment (MARTE). The imaging spectrometer is a
hyperspectral scanning pushbroom device sensitive to VNIR wavelengths from
400-1000 nm. During the MARTE project, the spectrometer was deployed to the Rio
Tinto region of Spain. We analyzed subsets of 3 cores from Rio Tinto using a
new band modeling technique. We found most of the MARTE drill cores to contain
predominantly goethite, though spatially coherent areas of hematite were
identified in Core 23. We also distinguished non Fe-bearing minerals that were
subsequently analyzed by X-ray diffraction (XRD) and found to be primarily
muscovite. We present drill core maps that include spectra of goethite,
hematite, and non Fe-bearing minerals.
