Science Advances

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• Fig. S1. Pressure-temperature phase diagram of MgSiO₃.
• Fig. S2. Polarized optical micrographs of a fragment of host rock captured in a shock vein.
• Fig. S3. Raman spectrum of majorite at the rim of a shock vein in Tenham.
• Fig. S4. Transmission electron micrograph of the entire ultrathin foil sample of a tetragonal majorite aggregate processed by an FIB.
• Fig. S5. Schematic diagrams of electron diffraction patterns of cubic ( Ia3d ) and tetragonal (I4₁/a) majorites along the ‹001› and ‹010› zone axes.
• Fig. S6. One- and two-dimensional electron diffraction profiles of natural and synthetic majorites.
• Fig. S7. One-dimensional thermal conductivity model used for estimating the
  temperature paths of a shock vein cooled by the host rock of a meteorite.
• Table S1. Chemical composition of (Mg,Fe)SiO₃ tetragonal majorite.

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