Enstatite Angel R J, Chopelas A, Ross N L Nature 358 (1992) 322-324 Stability of high-density clinoenstatite at upper-mantle pressures Sample: P = 7.93 GPa _database_code_amcsd 0014680 9.201 8.621 4.908 90 101.50 90 C2/c atom x y z Biso Si .2988 .0915 .2112 .29 Mg1 0 .9057 .25 .37 Mg2 0 .2742 .25 .57 O1 .1215 .0914 .139 .4 O2 .380 .2376 .367 .4 O3 .357 .0613 .915 .3