Citation: Grice, J. D.; Ercit, T. S. (1993). Ordering of Fe and Mg in the tourmaline crystal structure: The correct formula Sample: Dravite 32008. Neues Jahrbuch fur Mineralogie, Abhandlungen, 165, pp. 245-266.
Formula: Al5.47 B3 Ca0.35 F0.44 Fe1.1 H3.21 Li0.039 Mg2.35 Na0.55 O30.56 Si5.98 Ti0.05
List type: noninterleaving
List: 3D
Basis: (1;0;0 0;1;0 0;0;1)
Dimensionality: 3
Formula: Al18 B9 F3 Fe36 H9 Li9 Mg27 O96 Si18 Ti36 (Al6 B3 F Fe12 H3 Li3 Mg9 O32 Si6 Ti12)
Multiplicity: 1