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 = 7.3 GPa _database_code_amcsd 0004763 9.4711 8.6068 5.1915 90 106.633 90 C2/c atom x y z Biso Na 0 .3044 .25 1.09 Fe 0 .9014 .25 .64 Si .2911 .0917 .2365 .59 O1 .1146 .0821 .1416 .64 O2 .3574 .2607 .3135 .83 O3 .3549 .0156 .0058 .78