The solid solution Na(0.39)(NH(4))(1.61)SO(4)·Te(OH)(6)

The title compound, sodium ammonium sulfate–telluric acid (1/1), Na(0.39)(NH(4))(1.61)SO(4)·Te(OH)(6), is isostructural with other solid solutions in the series M (1−x)(NH(4))(x)SO(4)·Te(OH)(6), where ammonium is partially replaced with an alkali metal (M = K, Rb or Cs). The structure is composed of planes of Te(OH)(6) octa­hedra alternating with planes of SO(4) tetra­hedra. The Na(+)/NH(4) (+) cations are statistically distributed over the same position and are located between the planes. The structure is stabilized by O—H⋯O and N—H⋯O hydrogen bonds between the telluric acid adducts and the O atoms of sulfate groups, and between the ammonium cations and O atoms, respectively. Both Te atoms lie on centres of symmetry.