FIG. 15.

Mini-TES spectra of known opaline silica rocks resemble that of Pioneer Mound. Color of spectra keyed to color of Mini-TES sample spots shown here and in Fig. 14B and C. (A) Spectra of opaline silica rock “Nancy Warren” were acquired before (black) and after (red) additional dust contamination of Mini-TES optics. The opaline silica outcrop “Stapledon” was observed after this contamination (green), as was Pioneer Mound (blue; Fig. 14B). Despite significant mirror-dust features, all contaminated spectra share the opaline silica feature at 470 cm⁻¹ (vertical line) and similar features throughout; basaltic sand in front of Pioneer Mound does not (purple; Fig. 14C). (B) Nancy Warren with Mini-TES FOVs (Pancam false-color, sol 1190, P2534). (C) Stapledon with Mini-TES FOV (Pancam false-color, sol 1690, P2268).