Above what temperature will -cristobalite become the stable form of SiO2 (i.e., more stable than -quartz) at 1 bar?

Formula Form Mol, wt. g mol-1 AfH AG kJ mol- S Jmol-'K- --k- v cm mol- 22.688 Silicon Si SIO2 SiO2 SiO2 SIO2 SIO2 SIO2 H4S104 HSO3 28.0860 a-quartz 60.0848 a-cristobalite 60.0848 a-tridymite 60.0848 coesite 60.0848 amorphous 60.0848 aq 60.0848 ag aq 0 0 18.83 -910.94 -856.64 41.84 -909.48 --855.43 42.68 -909.06 --855.26 43.5 -906.31 -851.62 40.376 -903.49 -850.70 46.9 -877.699 -833.411 75.312 -1449.359-1307.669 215.132 -1125.583-1013.783 41.84 20.00 44.43 44.18 44.60 43.51 44.4 318.40 468.98 - 137.24 25.740 20.641 16.1 9.5