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 25, Di55Jd30, diopside - jadeite join _database_code_amcsd 0001368 9.628 8.808 5.254 90 106.88 90 C2/c atom x y z occ Biso Mg1 0 .9055 .25 .59 0.53 Fe1 0 .9055 .25 .08 0.53 Ti1 0 .9055 .25 .01 0.53 Al1 0 .9055 .25 .32 0.53 Ca2 0 .2982 .25 .55 0.91 Na2 0 .2982 .25 .30 0.91 Fe2 0 .2982 .25 .07 0.15 Mg2 0 .2982 .25 .06 0.15 Si .2886 .0925 .2322 0.46 O1 .1141 .0832 .1379 0.84 O2 .3617 .2539 .3147 0.99 O3 .3520 .0149 .0023 0.73