Ferrosilite 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 = 1.71 GPa _database_code_amcsd 0008006 18.370 9.006 5.2084 90 90 90 Pbca atom x y z Biso FeM1 .3760 .6555 .8692 .44 FeM2 .3783 .4831 .3596 .45 SiTA .2716 .3397 .0438 .24 SiTB .4728 .3332 .7909 .21 O1a .1859 .340 .031 .26 O2a .3118 .500 .052 .77 O3a .3016 .234 .810 .02 O1b .5599 .336 .789 .68 O2b .4329 .481 .691 .33 O3b .4477 .199 .591 .12