Rustumite

Ca₁₀Cl₂H₂O₂₀Si₅

Nevskii, N. N.Ilyukhin, V. V.Khaui, R. A.Belov, N. V.

Soviet Physics Doklady (1979) 24, 812-814

a=7.62Å   b=18.54999Å   c=15.51Å

α=90°   β=104.3°   γ=90°