Aegirine McCarthy A C, Downs R T, Thompson R M, Redhammer G J American Mineralogist 93 (2008) 1829-1837 In situ high-pressure single-crystal X-ray study of aegirine, NaFe3+Si2O6, and the role of M1 size in clinopyroxene compressibility Locality: synthetic Note: Pressure = 8.63 GPa _database_code_amcsd 0004764 9.4426 8.5727 5.1740 90 106.482 90 C2/c atom x y z Biso Na 0 .3048 .25 .98 Fe 0 .9015 .25 .60 Si .2911 .0920 .2367 .60 O1 .1135 .0827 .1411 .70 O2 .3567 .2617 .3144 .95 O3 .3558 .0175 .0044 .59