Citation: Grice, J. D.; Ercit, T. S. (1993). Ordering of Fe and Mg in the tourmaline crystal structure: The correct formula Sample: Dravite 43167. Neues Jahrbuch fur Mineralogie, Abhandlungen, 165, pp. 245-266.
Formula: Al5.47 B3.17 Ca0.18 Fe1.67 H3.6 Mg1.86 Na0.77 O31 Si5.78 Ti0.05
List type: noninterleaving
List: 3D
Basis: (1;0;0 0;1;0 0;0;1)
Dimensionality: 3
Formula: Al27 B27 Fe36 H9 Mg27 O96 Si18 Ti18 (Al9 B9 Fe12 H3 Mg9 O32 Si6 Ti6)
Multiplicity: 1