This data set contains JPEG images of potential martian analog
materials taken at 10 micrometers/pixel, approximately the scale
of a geologist's handlens, along with a table of associated
measurements and other information about each sample.
Citation
Yingst, R.A., Mars analog handlens-scale image database,
EAR-E-REBELXT-7-IMAGE-MARS-ANALOG-V1.0, NASA Planetary Data
System, 2009.