Aegirine McCarthy A C, Downs R T, Thompson R M, Redhammer G J American Mineralogist 93 (2008) 1829-1837 In situ high-pressure single-crystal X-ray study of aegirine, NaFe3+Si2O6, and the role of M1 size in clinopyroxene compressibility Locality: synthetic Note: Pressure = 0.0001 GPa _database_code_amcsd 0004759 9.6539 8.7928 5.2935 90 107.436 90 C2/c atom x y z Biso B(1,1) B(2,2) B(3,3) B(1,2) B(1,3) B(2,3) NaM2 0 .2992 .25 1.022 .00364 .00275 .00714 0 -.00050 0 FeM1 0 .89878 .25 .407 .00119 .00128 .00404 0 .00057 0 Si .29072 .08945 .23561 .370 .00106 .00132 .00344 -.00012 .00066 -.00008 O1 .1143 .0786 .1376 .508 .00124 .00187 .00508 -.00018 .00069 -.00008 O2 .3588 .2558 .3007 .674 .00238 .00170 .00722 -.00059 .00164 -.00062 O3 .3520 .0078 .0120 .585 .00145 .00241 .00510 .00001 .00081 -.00077