Diopside Cameron M, Sueno S, Prewitt C T, Papike J J American Mineralogist 58 (1973) 594-618 High-temperature crystal chemistry of acmite, diopside, hedenbergite, jadeite, spodumene, and ureyite T = 1000 C pyroxene _database_code_amcsd 0000344 9.822 9.081 5.285 90 105.98 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 .2859 .0924 .2292 .00337 .00464 .01349 -.00030 .00184 -.00039 Mg1 0 .9063 1/4 .00551 .00613 .01529 0 .00190 0 Ca2 0 .3001 1/4 .01028 .00628 .02088 0 -.00104 0 O1 .1164 .0864 .1423 .00387 .00740 .01888 -.00007 .00176 .00020 O2 .3607 .2464 .3143 .00858 .00613 .02521 -.00241 .00278 -.00172 O3 .3487 .0146 -.0024 .00527 .00837 .01751 .00029 .00325 -.00376