Science Advances

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• fig. S1. Parts of the integrated diffraction images of bridgmanite Mg_0.86Fe_0.14Al_0.04Si_0.96O₃ (FE14) collected before (lower curve) and during (upper curve) laser heating.
• fig. S2. Full high-resolution 2D wide-scan x-ray diffraction images of bridgmanite samples FE14, FE17, and FE40.
• fig. S3. Representative polyhedral structural model of orthorhombic bridgmanite.
• fig. S4. Backscattered electron image of skiagite starting composition at 23 GPa and 1600°C (run S6151).
• fig. S5. Typical powder x-ray diffraction patterns of skiagite-majorite garnet that was laser-heated at different pressures and temperatures (St, stishovite; hFe₃O₄, orthorhombic CaTi₂O₄-type Fe₃O₄; Pv, perovskite-structured phase).
• fig. S6. Crystal structure of Fe₄O₅ obtained as the product of decomposition of skiagite-majorite garnet in a laser-heated DAC at 39(1) GPa and 2250(100) K (see table S4 for crystallographic data).
• fig. S7. Variation with pressure of the normalized unit-cell parameters for three bridgmanites—Fe-bridgmanite (this study), (Mg_0.96,Fe_0.04)SiO₃ (32), and Mg_0.60Fe_0.40Si_0.63Al_0.37O₃ (12).
• fig. S8. Effect of Fe^ASiO₃, Fe^AAl^BO₃, and Fe^3+,A_2/3SiO₃ substitutions in bridgmanite on the bulk modulus ("A" and "B" denote structural positions; see table S3 for references).
• table S1. Crystallographic data for Fe,Al bridgmanite samples FE14, FE17, and FE40 at selected pressures before and after laser heating at different temperatures.
• table S2. Crystallographic data for (Fe²⁺_0.64(2)Fe³⁺_0.24(2))Si_1.00(3)O₃ bridgmanite at selected pressures.
• table S3. Compressibility of bridgmanite with different compositions.
• table S4. Crystallographic data of Fe₄O₅.

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