Mid-infrared spectra and statistical analysis of unshocked and shocked Fa₅₀ olivine. (a) Average mid-infrared spectra of olivine in the range of 1250–650 cm⁻¹ under different shock pressures. The MIR reflectance intensity of the shocked olivine samples exhibited a general decrease compared to that of the initial unshocked samples. (b) Point-line plot illustrating the variations in the CF (Christiansen feature) and RB (Reststrahlen band) peaks positions in the mid-infrared spectra of olivine samples as a function of shock pressure. At 47 GPa, RB1 developed a shoulder peak, causing it to be excluded from the statistical graph. Note that, at 31 GPa, two distinct regions, greenish white (powdered) and black (melted), were observed with the naked eye (Fig. A.1d). This results in CF and RB exhibiting two different values for the 31 GPa condition, representing the powdered and melted results, respectively. The RB2 and RB3 peaks remain relatively stable overall, CF, RB1, and RB4 peaks exhibited evident shifts under shock pressures.