Last updated on April 18, 2014 at 17:24 EDT
Water-Signature Mineral Found by Spirit
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Water-Signature Mineral Found by Spirit

January 3, 2005
This spectrum, taken by the Mars Exploration Rover Spirit's Mössbauer spectrometer, shows the presence of an iron-bearing mineral called goethite in a rock called "Clovis" in the "Columbia Hills" of Mars. Goethite contains water in the form of hydroxyl as a part of its structure. By identifying this mineral, the examination of Clovis produced strong evidence for past water activity in the area that Spirit is exploring.