Citation: Niven, M. L.; Waters, D. J.; Moore, J. M. (1991). The crystal structure of werdingite, (Mg,Fe)2Al12(Al,Fe)2Si4(B,Al)4O37, and its relationship to sillimanite, mullite and grandidierite. American Mineralogist, 76, pp. 246-256.
Formula: Al6.25 B2.54 Fe0.37 Mg0.84 O18.5 Si2
List type: noninterleaving
List: 3D
Basis: (1;0;0 0;1;0 0;0;1)
Dimensionality: 3
Formula: Al18 B6 Fe4 Mg2 O40 Si4 (Al9 B3 Fe2 Mg O20 Si2)
Multiplicity: 1