Microsommite

Al₉Ca₃Cl₃K_3.36Na_5.64O₄₂S_1.5Si₉

Bonaccorsi, E.Merlino, S.Pasero, M.Macedonio, G.

Physics and Chemistry of Minerals (2001) 28, 509-522

a=22.161Å   b=22.161Å   c=5.358Å

α=90°   β=90°   γ=120°