Protoenstatite Jahn S, Martonak R American Mineralogist 94 (2009) 950-956 Phase behavior of protoenstatite at high pressure studied by atomistic simulations Locality: theoretical structure _database_code_amcsd 0004955 9.171 8.513 5.254 90 90 90 Pbcn atom x y z O1 .1181 .0947 .0792 O2 .3758 .2519 .0697 O3 .3493 .9763 .2928 Si .2913 .0920 .0679 Mg1 0 .0944 .75 Mg2 0 .2666 .25