Diopside Plonka A M, Dera P, Irmen P, Rivers M L, Ehm L, Parise J B Geophysical Research Letters 39 (2012) L24307 Beta-diopside, a new ultrahigh-pressure polymorph of CaMgSi2O6 with six-coordinated silicon Note: P = 38.6 GPa Locality: natural, not reported _database_code_amcsd 0020130 9.234 8.255 4.959 90 104.592 90 C2/c atom x y z Uiso Ca 0 .3109 .25 .006 Mg 0 .0861 .75 .004 Si .2864 .0990 .2323 .005 O1 .1096 .0898 .1367 .007 O2 .3527 .2689 .3341 .011 O3 .1405 .4726 .0114 .008