Barylite

BaBe₂O₇Si₂

Abrashev, K. K.Ilyukhin, V. V.Belov, N. V.

Soviet Physics Crystallography (1965) 9, 691-699

a=9.79Å   b=11.01Å   c=4.63Å

α=90°   β=90°   γ=90°