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Single-crystal diffraction of jarosite, KFe 3  3+ (SO 4 ) 2 (OH) 6 , has been undertaken at low temperatures that proxy for martian surface conditions. Room-temperature data are consistent with literature data [a = 7.2913(5), c = 17.1744(17), and V = 790.72(11) in R3̅m], while the first low-temperature data for the mineral is presented (at 253, 213, 173, and 133 K). Data collections between 297 and 133 K show strongly anisotropic thermal expansion, with the c axis much more expandable than the a axis. Much of the anisotropy is due to strong distortion of the KO 12  polyhedron, which increases by 8% between 297 and 133 K. The data sets can aid in the identification of jarosite by X‑ray diffraction of martian soils using the Curiosity Rover’s CheMin instrument.

american mineralogist

What Lurks in the Martian Rocks and Soil? Investigations of Sulfates, Phosphates, and Perchlorates. Looking for jarosite on Mars: The low-temperature crystal structure of jarosite