Figure 1: A ringwoodite crystal within an impact-melt pocket.
From: The Tissint Martian meteorite as evidence for the largest impact excavation
The green-coloured ringwoodite (olivine, 75 × 140 μm2) crystal is shown within a large impact-melt pocket (400 × 350 μm2). This crystal is isotropic under cross-polarized light. Selected chemical analyses are listed in Table 1, and more details are given in the Supplementary Information. Raman spectra of this crystal (spot no. 4 and no. 5) show characteristic absorption bands for ringwoodite. The low-P polymorph of olivine nearby displays a different structure (spot no. 3). Numbers next to circles indicate the respective Raman spots.
