Fig. 3: PIXL MCC (Micro Context Camera) reflectance analysis of the Onahu Fe-phosphates.
From: Fe-phosphates in Jezero Crater as evidence for an ancient habitable environment on Mars
A WATSON image of the Fe-phosphates within the Ouzel_Falls abrasion patch with no enhancement so colors are more comparable to PIXL MCC. B PIXL MCC false color RGB image, C PIXL MCC Green/Near Infrared (G/NIR) image. Fe-phosphate grains are circled in each image, with 4 representative grains selected for reflectance spectra comparison. D Binary plot showing the variation in UV/NIR and G/NIR in the Ouzel_Falls abrasion patch. The Ouzel_Falls Fe-phosphate grains plot in between terrestrial ferrous and ferric phosphates and surrounding matrix indicating they are likely mixtures at PIXL’s MCC resolution. Compilation of reflectance spectra for terrestrial phosphate minerals (sourced from the RELAB database29 [samples: vivianite specimen JB-JLB-G65, strunzite specimen JB-JLB-B99-B, strengite specimen JB-JLB-742], University of Winnipeg for metavivianite [collected using methods from75], and30 for synthetic vivianite* subjected to 1 minute of oxidation vs. 23 hours of oxidation.
