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Reference [1] describes the finding of jarosite in the Mawrth Vallis region of Mars. The NASA Mars rovers include IR spectroscopy in their instrumentation, and that was the method used. The finding of potassium jarosite, $\text{KFe}_3\text{(SO}_4\text{)}_2\text{(OH}\text{)}_6$, is rendered graphically in thus figure taken from the reference. The jarosite ...

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