Citation: Gibbs, G. V. (1966). The polymorphism of cordierite I: The crystal structure of low cordierite. American Mineralogist, 51, pp. 1068-1087.
Formula: Al4 Ca0.03 Fe0.46 H0.96 K0.02 Li0.12 Mg1.54 Na0.1 O18.48 Si5
List type: noninterleaving
List: 3D
Basis: (1;0;0 0;1;0 0;0;1)
Dimensionality: 3
Formula: Al20 Fe8 Mg8 O72 Si28 (Al5 Fe2 Mg2 O18 Si7)
Multiplicity: 1