Sursassite

Al_2.58H_3.42Mg_2.42O₁₄Si₃

Gottschalk, M.Fockenberg, T.Grevel, K.-D.Wunder, B.Wirth, R.Schreyer, W.Maresch, W. V.

European Journal of Mineralogy (2000) 12, 935-945

a=8.5424Å   b=5.7117Å   c=9.6484Å

α=90°   β=108.298°   γ=90°