Computer Science
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..883m&link_type=abstract
Lunar and Planetary Science, volume 27, page 883
Computer Science
1
Colorimetry: Differential Scanning, Diffraction: X-Ray, Jarosites
Scientific paper
Jarosite, a ferric hydroxysulfate, occurs in some tephra samples on Mauna Kea volcano in Hawaii. The mineralogy and thermal properties of two jarositic tephra samples were characterized by X-ray diffraction (XRD) analysis and differential scanning calorimetry (DSC). XRD analysis of the <5 mm fraction of the tephra indicated nearly monomineralic jarosite in both samples. DSC signatures indicated two strong endoenthalpic transitions for jarosite at near 670 and 950 K, which represent dehydroxylation and ferric sulfate decomposition of jarosite, respectively. If jarosite exists on the surface of Mars, it should be easy to identify with DSC interfaced to an evolved-gas analyzer during a robotic mission (e.g., Mars Surveyor Program.
Bell James Francis III
Golden D. C.
Gooding James L.
Ming Douglas W.
Morris Richard V.
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