Megacyclite

H₄₆KNa₈O₄₆Si₉

Zubkova, N. V.Pekov, I. V.Chukanov, N. V.Listsin, D. V.Rabadanov, M. K.Pushcharovsky, D. Y.

New Data on Minerals. Moscow (2007) 42, 81-92

a=24.8219Å   b=11.9236Å   c=14.8765Å

α=90°   β=94.486°   γ=90°