Gunterblassite

Ba_0.3Ca_0.7Fe_0.5H₁₈K_1.2Mg_0.15Na_0.15O₃₆Si₁₃

Rastvetaeva, R. K.Aksenov, S. M.Chukanov, N. V.

Doklady Chemistry (2012) 442, 57-62

a=6.538Å   b=6.975Å   c=37.26Å

α=90°   β=90°   γ=90°