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 = 24 C pyroxene _database_code_amcsd 0000340 9.745 8.899 5.251 90 105.63 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 .2862 .0933 .2293 .00055 .00071 .00256 -.00003 .00025 -.00010 Mg1 0 .9082 1/4 .00075 .00075 .00246 0 .00009 0 Ca2 0 .3015 1/4 .00180 .00115 .00424 0 -.00033 0 O1 .1156 .0873 .1422 .00061 .00125 .00355 .00006 .00011 .00017 O2 .3611 .25 .3180 .00151 .00095 .00497 -.00055 .00029 -.00009 O3 .3505 .0176 .9953 .00092 .00153 .00341 .00000 .00052 -.00069