Jadeite 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 2H, Di46Jd55, diopside - jadeite join _database_code_amcsd 0001371 9.545 8.713 5.246 90 106.90 90 C2/c atom x y z occ Biso Al1 0 .9061 .25 .60 0.39 Mg1 0 .9061 .25 .37 0.39 Fe1 0 .9061 .25 .03 0.39 Na2 0 .3021 .25 .55 0.77 Ca2 0 .3021 .25 .45 0.77 Si .2884 .0931 .2269 .96 0.34 Al .2884 .0931 .2269 .04 0.34 O1 .1112 .0797 .1324 0.73 O2 .3604 .2580 .3039 0.73 O3 .3524 .0127 -.0006 0.58