Using synchrotron radiation, Fe x-ray absorption spectra have been collected from a Mg0.88Fe0.12SiO8 perovskite quenched from 50 GPa and ~2000 K. Least-squares fits of the Extended X-ray Absorption Fine Structure (EXAFS) data yield an Fe coordination number of 5.5 (¿0.8) oxygens, an Fe-O distance of 214 (¿4) pm, and a static and thermal disorder parameter of 147 pm2. The absorption edge spectrum shows a weak pre-edge feature suggesting little deviation from centrosymmetry for the Fe site. These results indicate that Fe in this silicate perovskite partitions perdominantly into the six-coordinated site and may provide the first evidence for Si occupying an 8--12 coordinated site. ¿ American Geophysical Union 1987