Merrihueite

K₂Mg₅O₃₀Si₁₂

Khan, A. A.Baur, W. H.Forbes, W. C.

Acta Crystallographica, Section B (1972) 28, 267-272

a=10.222Å   b=10.222Å   c=14.152Å

α=90°   β=90°   γ=120°