Citation: Miyashiro, A. (1956). Osumilite, a new silicate mineral, and its crystal structure. American Mineralogist, 41, pp. 104-116.
Formula: Al4.95 Ca0.12 Fe1.57 H K0.32 Mg1.48 Na0.35 O30 Si9
List type: noninterleaving
List: 3D
Basis: (1;0;0 0;1;0 0;0;1)
Dimensionality: 3
Formula: Al30 Fe10 Mg4 O60 Si24 (Al15 Fe5 Mg2 O30 Si12)
Multiplicity: 1