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 = 5.47 GPa _database_code_amcsd 0004762 9.5148 8.6568 5.2188 90 106.844 90 C2/c atom x y z Biso Na 0 .3029 .25 1.11 Fe 0 .9006 .25 .58 Si .2909 .0909 .2366 .54 O1 .1141 .0801 .1414 .67 O2 .3573 .2602 .3081 .77 O3 .3548 .0130 .0094 .72