Nepheline

Al₄K_0.675Na₃O₁₆Si₄

Hassan, I.Antao, S. M.Hersi, A. A. M.

The Canadian Mineralogist (2003) 41, 759-783

a=9.9853Å   b=9.9853Å   c=8.3689Å

α=90°   β=90°   γ=120°