Pollucite

Al_1.536Cs_1.34H₄Na_0.204O_12.66Si_4.434

Gatta, G. D.Rotiroti, N.Boffa Ballaran, T.Sanchez-Valle CPavese, A.

American Mineralogist (2009) 94, 1137-1143

a=13.667Å   b=13.667Å   c=13.667Å

α=90°   β=90°   γ=90°