Schorl

Al_6.09B₃Ca_0.17Fe_2.43H₄K_0.01Li_0.06Mg_0.12Mn_0.03Na_0.88O₃₁Si₆Ti_0.06

Fortier, S.Donnay, G.

The Canadian Mineralogist (1975) 13, 173-177

a=15.992Å   b=15.992Å   c=7.190Å

α=90°   β=90°   γ=120°