Citation: Grice, J. D.; Ercit, T. S. (1993). Ordering of Fe and Mg in the tourmaline crystal structure: The correct formula Sample: Dravite 43230. Neues Jahrbuch fur Mineralogie, Abhandlungen, 165, pp. 245-266.
Formula: Al6.109 B3.08 Ca0.09 F0.17 Fe0.06 H3.58 Li0.002 Mg2.73 Na0.82 O30.83 Si5.9 Ti0.11
List type: noninterleaving
List: 3D
Basis: (1;0;0 0;1;0 0;0;1)
Dimensionality: 3
Formula: Al27 B27 F3 Fe18 H9 Li9 Mg27 O96 Si18 Ti36 (Al9 B9 F Fe6 H3 Li3 Mg9 O32 Si6 Ti12)
Multiplicity: 1