Dravite

Al_5.91B_3.18Ca_0.02F_0.07Fe_0.63H_3.93Mg_2.37Na_0.96O_30.93Si_5.82Ti_0.06

Marschall, H. R.Ertl, A.Hughes, J. M.McCammon, C. A.

European Journal of Mineralogy (2004) 16, 817-823

a=15.9443Å   b=15.9443Å   c=7.2094Å

α=90°   β=90°   γ=120°