Diopside Oberti R, Caporuscio F A American Mineralogist 76 (1991) 1141-1152 Crystal chemistry of clinopyroxenes from mantle eclogites: A study of the key role of the M2 site population by means of crystal-structure refinement sample SBB 34, Di62Jd24, diopside - jadeite join _database_code_amcsd 0001365 9.662 8.841 5.253 90 106.78 90 C2/c atom x y z occ Biso Mg1 0 .9056 .25 .65 0.63 Al1 0 .9056 .25 .22 0.63 Fe1 0 .9056 .25 .13 0.63 Ca2 0 .2973 .25 .61 0.96 Na2 0 .2973 .25 .25 0.96 Mg2 0 .2973 .25 .07 0.30 Fe2 0 .2973 .25 .07 0.30 Si .2886 .0924 .2331 0.49 O1 .1148 .0844 .1395 0.86 O2 .3621 .2524 .3179 1.07 O3 .3517 .0160 .0017 0.79