Diopside Harlow G E American Mineralogist 81 (1996) 632-638 Structure refinement of a natural K-rich diopside: The effect of K on the average structure _database_code_amcsd 0001796 9.7476 8.9478 5.2622 90 106.056 90 C2/c atom x y z occ Biso U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3) Mg1 0 .9069 .25 .885 .0072 .0060 .0074 0 .0003 0 Fe1 0 .9069 .25 .023 .0072 .0060 .0074 0 .0003 0 Al1 0 .9069 .25 .021 .0072 .0060 .0074 0 .0003 0 Cr1 0 .9069 .25 .071 .0072 .0060 .0074 0 .0003 0 Ca2 0 .3008 .25 .798 .0102 .0093 .0069 0 -.0020 0 K2 0 .3008 .25 .073 .0102 .0093 .0069 0 -.0020 0 Na2 0 .3008 .25 .023 .0102 .0093 .0069 0 -.0020 0 Mg2' 0 .264 .25 .070 3.9 Fe2' 0 .264 .25 .036 3.9 Si .28726 .09254 .2300 .996 .0079 .0064 .0089 -.0003 .0023 -.0006 Al .28726 .09254 .2300 .004 .0079 .0064 .0089 -.0003 .0023 -.0006 O1 .1154 .0861 .1415 .0089 .012 .012 .0006 .0023 -.0000 O2 .3621 .2498 .3193 .018 .009 .019 -.0044 .0073 -.0027 O3 .3502 .0182 .9951 .0078 .015 .011 -.0002 .0025 -.0045