Barytolamprophyllite

Ba_0.9Fe_0.6H₂Mg_0.3Mn_0.2Na_2.8O₁₈Si₄Sr_1.1Ti_2.1

Rastsvetaeva, R. K.Dorfman, M. D.

Crystallography Reports (1995) 40, 951-954

a=19.744Å   b=7.099Å   c=5.409Å

α=90°   β=96.77°   γ=90°