Citation: Bosi, F.; Lucchesi, S.; Reznitskii, L. (2004). Crystal chemistry of the dravite-chromdravite series Note: Tourmaline TMt3c. European Journal of Mineralogy, 16, pp. 345-352.
Formula: Al2.856 B3 Ca0.043 Cr3.372 F0.361 Fe0.027 H2.937 K0.027 Mg2.085 Na0.842 O30.639 Si5.868 Ti0.003 V0.783 Zn0.009
List type: noninterleaving
List: 3D
Basis: (1;0;0 0;1;0 0;0;1)
Dimensionality: 3
Formula: Al45 B9 Cr27 F3 Fe27 Mg27 O102 Si18 Ti9 V9 Zn9 (Al15 B3 Cr9 F Fe9 Mg9 O34 Si6 Ti3 V3 Zn3)