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 = 0.00 GPa, natural orthopyroxene _database_code_amcsd 0008018 18.231 8.8095 5.1873 90 90 90 Pbca atom x y z occ Biso MgM1 .3757 .6529 .8652 .08 MgM2 .3785 .4842 .3582 .66 .08 FeM2 .3785 .4842 .3582 .24 .08 CaM2 .3785 .4842 .3582 .012 .08 AlM2 .3785 .4842 .3582 .08 .08 SiTA .2701 .3424 .0491 .97 .00 AlTA .2701 .3424 .0491 .03 .00 SiTB .4740 .3377 .8013 .97 .16 AlTB .4740 .3377 .8013 .03 .16 O1a .182 .340 .031 .20 O2a .312 .502 .050 .20 O3a .303 .2254 .826 .20 O1b .565 .338 .806 .20 O2b .435 .4856 .691 .20 O3b .446 .1943 .605 .20