Samples of omphacitic eclogite from Fattigau/Germany were shock-loaded to pressures of 18, 45, and 59 GPa. The recovered specimens were investigated by x-ray diffraction experiments and showed all those reflections typical of the well known high-pressure phases. The unusual appearence of the perovskite-structured MgSiO3 at the shock-loading pressure of 18 GPa is in contrast to results of Liu (1980) and could be attributed to strong nonequilibrium processes caused by shock waves.