Ca11.76 ((Si0.75 Al0.25)4.44 O19.82) Cl1.05

Al_1.11Ca_11.76Cl_1.05O_19.82Si_3.33

Ilyukhin, V.V.Nevskii, N.N.Howie, R.A.Bickbau, M.J.

Nature (London) (1977) 269, 397-398

a=10.4714Å   b=10.4714Å   c=8.6171Å

α=90°   β=90°   γ=90°