Hedenbergite 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 = 900 C pyroxene _database_code_amcsd 0000349 9.906 9.164 5.273 90 105.22 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 .2872 .0915 .2327 .00351 .00427 .01116 -.00027 .00159 -.00032 Fe1 0 .9051 1/4 .00495 .00543 .01422 0 .00122 0 Ca2 0 .2987 1/4 .00913 .00587 .01977 0 -.00088 0 O1 .1193 .0889 .1506 .00373 .00719 .01855 -.00020 .00198 -.00001 O2 .3617 .2429 .3188 .00823 .00565 .02357 -.00194 .00248 -.00063 O3 .3486 .0162 .9973 .00517 .00758 .01698 .00005 .00323 -.00458