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 39, Di52Jd27, diopside - jadeite join _database_code_amcsd 0001367 9.644 8.820 5.256 90 107.04 90 C2/c atom x y z occ Biso Mg1 0 .9051 .25 .57 0.63 Al1 0 .9051 .25 .27 0.63 Fe1 0 .9051 .25 .14 0.63 Ti1 0 .9051 .25 .01 0.63 Mn1 0 .9051 .25 .01 0.63 Ca2 0 .2958 .25 .52 1.07 Na2 0 .2958 .25 .29 1.07 Fe2 0 .2958 .25 .10 0.42 Mg2 0 .2958 .25 .09 0.42 Si .2892 .0922 .2347 0.55 O1 .1146 .0837 .1393 0.93 O2 .3626 .2532 .3178 1.17 O3 .3522 .0151 .0044 0.87