NASA’s Perseverance rover has discovered several thousand small, light-toned rock fragments, or float rocks, with some exhibiting spectral signatures of an aluminum-rich clay mineral called kaolinite. To interpret their formation, planetary researchers used data from Perseverance’s SuperCam and Mastcam-Z instruments to compare the chemistry and reflectance spectra of the float rocks with deeply weathered paleosols (ancient soils) and hydrothermal...
