Jarosite and hematite at Meridiani Planum from Opportunity's Mossbauer Spectrometer.


Mossbauer spectra measured by the Opportunity rover revealed four mineralogical components in Meridiani Planum at Eagle crater: jarosite- and hematite-rich outcrop, hematite-rich soil, olivine-bearing basaltic soil, and a pyroxene-bearing basaltic rock (Bounce rock). Spherules, interpreted to be concretions, are hematite-rich and dispersed throughout the outcrop. Hematitic soils both within and outside Eagle crater are dominated by spherules and their fragments. Olivine-bearing basaltic soil is present throughout the region. Bounce rock is probably an impact erratic. Because jarosite is a hydroxide sulfate mineral, its presence at Meridiani Planum is mineralogical evidence for aqueous processes on Mars, probably under acid-sulfate conditions.

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@article{Klingelhfer2004JarositeAH, title={Jarosite and hematite at Meridiani Planum from Opportunity's Mossbauer Spectrometer.}, author={G{\"{o}star Klingelh{\"{o}fer and Richard V. Morris and Botond Bernhardt and Christian Schroeder and Daniel S. Rodionov and Paulo S{\'e}rgio Alves de Souza and Albert S. Yen and Ralf Gellert and E. N. Evlanov and Bella Zubkov and J. Foh and U . Bonnes and E . Kankeleit and Philipp G{\"{u}tlich and D W Ming and Franz Renz and Tom Wdowiak and Steve Squyres and Raymond E. Arvidson}, journal={Science}, year={2004}, volume={306 5702}, pages={1740-5} }