Diopside Levien L, Prewitt C T American Mineralogist 66 (1981) 315-323 High-pressure structural study of diopside P = 45.5 kbar pyroxene _database_code_amcsd 0000814 9.630 8.785 5.1895 90 105.37 90 C2/c atom x y z B(1,1) B(2,2) B(3,3) B(1,2) B(1,3) B(2,3) Si .2863 .09449 .2279 .0008 .0011 .0026 -.00014 .0004 -.0001 Mg1 0 .90940 .25 .0009 .0011 .0024 0 .0003 0 Ca2 0 .30378 .25 .0020 .0013 .0039 0 0 0 O1 .1150 .0879 .1421 .0010 .0016 .0044 .00010 .0006 0 O2 .3611 .2534 .3201 .0014 .0019 .0057 -.00060 .0012 -.0004 O3 .3530 .0207 .9901 .0010 .0021 .0038 -.00030 .0008 -.0009