The Hugoniot equation of state of jadeite (NaAlSi2O6) was investigated with a two-stage light gas gun extending the range of shock pressure up to 150 GPa. From the present results coupled with previous data a high-pressure phase transformation was observed in jadeite over 60 GPa. Moreover, the Hugoniot elastic limit was found to be ~7 GPa. Fitting the theoretical Hugoniot equation of state to the high-pressure phase results in a bulk modulus at ambient condition of 280¿10 GPa for a zero-pressure density of 4.26¿0.05 g cm-3. These physical properties for high-pressure NaAlSi2O6 are consistent with the perovskite-type structure at pressure above 120 GPa. Because its density is close to MgSiO3 and CaSiO3 perovskites, NaAlSi2O6 perovskite is a candidate to be a host for sodium and aluminum near the core-mantle boundary. ¿ 1998 American Geophysical Union