Lamprophyllite

Ba_0.667CaF_0.667FeH_0.667K_0.667Mn_0.5NaO_17.333Si₄Sr_0.667Ti_2.5

Saf'yanov, Y. N.Vasil'eva, N. O.Golovachev, V. P.Kuz'min, E. A.Belov, N. V.

Soviet Physics Doklady (1983) 28, 207-209

a=19.431Å   b=7.086Å   c=5.392Å

α=90°   β=96.75°   γ=90°