Citation: Grice, J. D.; Ercit, T. S. (1993). Ordering of Fe and Mg in the tourmaline crystal structure: The correct formula Sample: Dravite 43873. Neues Jahrbuch fur Mineralogie, Abhandlungen, 165, pp. 245-266.
Formula: Al5.29 B3 Ca0.301 F0.42 Fe H3.28 Mg2.7 Na0.713 O30.58 Si5.94 Ti0.06
List type: noninterleaving
List: 3D
Basis: (1;0;0 0;1;0 0;0;1)
Dimensionality: 3
Formula: Al18 B9 F3 Fe36 H9 Mg27 O96 Si18 Ti18 (Al6 B3 F Fe12 H3 Mg9 O32 Si6 Ti6)
Multiplicity: 1