Citation: Brown, G.E.; Gibbs, G.V. (1969). Refinement of the crystal structure of osumilite. American Mineralogist, 54, pp. 101-114.
Formula: Al4.43 Fe1.29 H2 K0.78 Mg0.92 Mn0.16 Na0.22 O31 Si10.2
Chemical name: (K0.78 Na0.22) (Mg0.92 Fe0.92 Mn0.16) (Al2.63 Fe0.37) ((Si10.2 Al1.8) O30) (H2 O)
List type: noninterleaving
List: 3D
Basis: (1;0;0 0;1;0 0;0;1)
Dimensionality: 3
Formula: Al30 Fe10 Mg4 Mn4 O60 Si24 (Al15 Fe5 Mg2 Mn2 O30 Si12)
Multiplicity: 1