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 = 850 C pyroxene _database_code_amcsd 0000343 9.806 9.05 5.28 90 106 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 .2861 .0925 .2293 .00313 .00393 .01076 -.00030 .00150 -.00054 Mg1 0 .9066 1/4 .00472 .00521 .01249 0 .00182 0 Ca2 0 .3003 1/4 .00868 .00521 .01765 0 -.00054 0 O1 .1161 .0863 .1418 .00325 .00643 .01609 -.00001 .00167 .00043 O2 .3607 .2468 .3144 .00782 .00512 .02066 -.00225 .00257 -.00080 O3 .3492 .0151 .9976 .00467 .00745 .01495 .00004 .00274 -.00351