Eakerite

Al₂Ca₂H₆O₂₂Si₆Sn

Kossiakoff, A. A.Leavens, P. B.

American Mineralogist (1976) 61, 956-962

a=15.892Å   b=7.721Å   c=7.438Å

α=90°   β=101.34°   γ=90°