Aegirine

Fe_0.992Na_0.978O₆Si_1.96

Ballet, O.Coey, J. M. D.Fillion, G.Ghose, A.Hewat, A. W.Regnard, J. R.

Physics and Chemistry of Minerals (1989) 16, 672-677

a=9.68Å   b=8.83Å   c=5.30Å

α=90°   β=107.3°   γ=90°