Citation: Bosi, F.; Lucchesi, S.; Reznitskii, L. (2004). Crystal chemistry of the dravite-chromdravite series Note: Tourmaline TMt3b. European Journal of Mineralogy, 16, pp. 345-352.
Formula: Al2.1 B3 Ca0.073 Cr4.347 F0.381 Fe0.051 H3.009 K0.017 Mg2.244 Na0.88 O30.618 Si5.886 Ti0.003 V0.354 Zn0.021
List type: noninterleaving
List: 3D
Basis: (1;0;0 0;1;0 0;0;1)
Dimensionality: 3
Formula: Al36 B9 Cr27 F3 Fe9 H9 Mg27 O96 Si18 Ti9 V9 Zn9 (Al12 B3 Cr9 F Fe3 H3 Mg9 O32 Si6 Ti3 V3 Zn3)
Multiplicity: 1