The coesite-stishovite phase boundary in the temperature range 2300--2630¿C was examined in a CO2-laser heated diamond anvil cell using argon as a pressure medium. Phase identification was provided by Raman spectroscopy of the temperature quenched samples at pressure. Our results suggest a coesite-stishovite phase boundary curve described by P(GPa)= 8.1+0.001T(¿C) in good agreement with Yagi and Akimoto's (1976) estimate at lower temperatures. The slope of this curve is less than one half that determined recently by Zhang et al. [1993, 1994> in a multi-anvil press. ¿American Geophysical Union 1995