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80 60 40 20 0 500 1000 1500 2000 SiO2 Pressure (kbar) Temperature (°C) Low Quartz Melt High Quartz Coesite Tridymite Cristobalite Stishovite
80 60 40 20 0 500 1000 1500 2000 SiO2 Pressure (kbar) Temperature (°C) Low Quartz Melt High Quartz Coesite Tridymite Cristobalite Stishovite