Dravite

Al_5.68B₃Cr_0.315Fe_0.635H₃Mg_2.001Na_0.96Ni_0.158O₃₁Si₆Ti_0.039V_0.031

Hughes, J. M.Rakovan, J.Ertl, A.Rossman, G. R.Baksheev, I.Bernhardt, H.-J.

The Canadian Mineralogist (2011) 49, 29-40

a=15.903Å   b=15.9118Å   c=7.2304Å

α=90.063°   β=89.793°   γ=119.742°