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 = 7.50 GPa, synthetic En60 orthopyroxene _database_code_amcsd 0008017 18.035 8.682 5.1138 90 90 90 Pbca atom x y z occ Biso MgM1 .3764 .6576 .8595 .59 .23 FeM1 .3764 .6576 .8595 .41 .23 MgM2 .3783 .4797 .3534 .59 .21 FeM2 .3783 .4797 .3534 .41 .21 SiTA .2706 .3434 .0381 .24 SiTB .4732 .3374 .8018 .28 O1a .1834 .338 .027 .50 O2a .3087 .508 .038 .47 O3a .3042 .2273 .815 .25 O1b .5596 .339 .803 .33 O2b .4342 .485 .688 .30 O3b .4450 .1921 .611 .35