Marianoite

Ca₄FFe_0.08Hf_0.01Mg_0.03Na₂Nb_0.97O₁₇Si₄Ti_0.09Zr_0.9

Chakhmouradian, A. R.Mitchell, R. H.Burns, P. C.Mikhailova, Y.Reguir, E. P.

The Canadian Mineralogist (2008) 46, 1023-1032

a=10.8459Å   b=10.2260Å   c=7.2727Å

α=90°   β=109.332°   γ=90°