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 = 1.78 GPa _database_code_amcsd 0004760 9.6067 8.7501 5.2698 90 107.258 90 C2/c atom x y z Biso Na 0 .3002 .25 1.08 Fe 0 .8997 .25 .64 Si .2904 .0901 .2355 .61 O1 .1150 .0792 .1397 .80 O2 .3595 .2567 .3028 .90 O3 .3527 .0107 .0110 .74