Hyalophane

Al_1.41Ba_0.4K_0.47Na_0.13O₈Si_2.59

Viswanathan, K.Kielhorn, H. M.

American Mineralogist (1983) 68, 122-124

a=8.544Å   b=13.030Å   c=7.195Å

α=90°   β=115.68°   γ=90°