Enstatite Hugh-Jones D A, Chopelas A, Angel R J Physics and Chemistry of Minerals 24 (1997) 301-310 Tetrahedral compression in (Mg,Fe)SiO3 orthopyroxenes Sample: P = 6.59 GPa, synthetic En60 orthopyroxene _database_code_amcsd 0008016 18.0665 8.706 5.1236 90 90 90 Pbca atom x y z occ Biso MgM1 .3763 .6576 .8612 .59 .06 FeM1 .3763 .6576 .8612 .41 .06 MgM2 .3783 .4802 .3544 .59 .06 FeM2 .3783 .4802 .3544 .41 .06 SiTA .2712 .3413 .0393 .01 SiTB .4729 .3377 .8010 .02 O1a .1827 .340 .028 .05 O2a .3091 .506 .040 .10 O3a .3043 .230 .815 .07 O1b .5614 .339 .806 .06 O2b .4337 .485 .687 .07 O3b .4454 .194 .608 .24