Page 1 Page 2 Page 3 Page 4 Page 5 Page 6 Page 7 Stishovite Coesite α- quartz β- quartz Liquid TridymiteCristobalite 600 1000 1400 1800 2200 2600 2 4 6 8 10 Pre ssur e (G Pa) Temperature oCPage 8 P6222 P3221Page 9 Page 10 Page 11