Fenaksite

FeKNaO₁₀Si₄

Golovachev, V. P.Drozdov, Y. N.Kuz'min, E. A.Belov, N. V.

Soviet Physics Doklady (1971) 15, 902-904

a=6.98Å   b=8.24Å   c=9.98Å

α=114.2°   β=80.23°   γ=115.6°