Citation: Grice, J. D.; Ercit, T. S. (1993). Ordering of Fe and Mg in the tourmaline crystal structure: The correct formula Sample: Povondraite 144478. Neues Jahrbuch fur Mineralogie, Abhandlungen, 165, pp. 245-266.
Formula: Al0.32 B3.06 Fe6.82 H3.3 K0.26 Mg1.85 Na0.79 O31 Si5.94 V0.01
List type: noninterleaving
List: 3D
Basis: (1;0;0 0;1;0 0;0;1)
Dimensionality: 3
Formula: Al18 B27 Fe36 H9 Mg27 O96 Si18 V9 (Al6 B9 Fe12 H3 Mg9 O32 Si6 V3)
Multiplicity: 1