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. 2020 Sep 23;125(9):e2019JE006294. doi: 10.1029/2019JE006294

Figure 3.

Figure 3

(top) Laboratory spectra of ferric materials convolved to Mastcam (middle) and ChemCam passive spectral (bottom) wavelengths. Hematite can be uniquely identified in Mastcam spectra based on its absorption near 860 nm and also has an absorption near 530 nm and a peak at 750 nm. Laboratory spectra sources: USGS spectral library (all Kokaly et al., 2017)—Goethite WS222 Medium Gr. [W1R1Ba], ematite WS161 [W1R1Bb], hematite WS161 [W1R1Bb], ferrihydrite GDS75 Syn; F6 [W1R1Bb], magnetite HS78.3B [W1R1Bb], and Jarosite JR2501 (K) [W1R1Bb AREF]. PDS spectral library (https://speclib.rsl.wustl.edu/)—Akaganeite [AKS1_FP_0_C4S47398_0101] (Morris et al., 2000) and Nontronite [NBJB26] (Pieters, 1983).