Citation: Gibbs, G. V.; Ribbe, P. H. (1969). The crystal structures of the humite minerals: I. Norbergite. American Mineralogist, 54, pp. 376-390.
Formula: F1.8 H0.2 Mg3 O4.2 Si
List type: noninterleaving
List: 3D
Basis: (1;0;0 0;1;0 0;0;1)
Dimensionality: 3
Formula: F8 Mg12 O24 Si4 (F2 Mg3 O6 Si)
Multiplicity: 1