Evidence for Young Jarosite Precipitation on Mars

). Because jarosite is stable only under low pH conditions, it is an important environmental indicator mineral. Additionally, the large fraction of structural water in jarosite makes it an ideal target for indirect analysis of the Martian paleo-hydrosphere. We have extended our examination of sulfate al-teration in Miller Range 03346 to include veinlet material adja-cent to the fusion crust (hereafter FC) of the meteorite.