Diopside Levien L, Prewitt C T American Mineralogist 66 (1981) 315-323 High-pressure structural study of diopside P = 1 atm pyroxene _database_code_amcsd 0000811 9.7456 8.9198 5.2516 90 105.86 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 .28627 .09330 .22936 .00097 .00119 .0031 -.00005 .00040 -.00007 Mg1 0 .90814 .25 .00113 .00113 .0030 0 .00023 0 Ca2 0 .30144 .25 .00224 .00164 .0047 0 -.00015 0 O1 .11550 .08728 .14220 .00114 .00192 .0047 .00008 .00041 .00017 O2 .36136 .25013 .31830 .00221 .00172 .0059 -.00039 .00080 -.00030 O3 .35083 .01759 .99530 .00147 .00215 .0048 -.00003 .00080 -.00084