The oxoantimonate K-3[SbO4] crystallizes in the monoclinic space group P2/c
with the Na-3[BiO4] structure type. The structure contains chains of [SbO6
] octahedra connected via common edges. All K and Sb atoms lie on twofold a
xes, i.e. 0,y, 1/4 or 1/2,y, 1/4.