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 37, Di71Jd20, diopside - jadeite join _database_code_amcsd 0001364 9.678 8.853 5.255 90 106.52 90 C2/c atom x y z occ Biso Mg1 0 .9060 .25 .74 0.58 Al1 0 .9060 .25 .17 0.58 Fe1 0 .9060 .25 .08 0.58 Ti1 0 .9060 .25 .01 0.58 Ca2 0 .3003 .25 .71 0.85 Na2 0 .3003 .25 .20 0.85 Mg2 0 .3003 .25 .09 0.58 Si .2879 .0927 .2312 .99 0.50 Al .2879 .0927 .2312 .01 0.50 O1 .1146 .0848 .1388 0.80 O2 .3616 .2523 .3175 0.98 O3 .3515 .0163 -.0007 0.74