Frustrated magnetism in face-centered-cubic (fcc) magnetic sublattices remains underexplored but holds considerable potential for exotic magnetic behavior. Here we report on the crystal structure and the magnetic and thermodynamic properties of the $A$-site-vacant hydroxide double perovskite ${\mathrm{MnSn}\left(\mathrm{OH}\right)}_{\text{6}}$. Despite dominant antiferromagnetic interactions among ${\text{Mn}}^{2+}$ moments, evidenced by a negative Curie-Weiss temperature, the lack of a sharp thermodynamic transition down to 350 mK implies the absence of long-range magnetic order. However, a broad hump in the specific heat at 1.6 K suggests short-range correlations. Neutron diffraction at low temperatures confirms the presence of three-dimensional antiferromagnetic correlations, manifested as diffuse magnetic scattering with a correlation length $\xi =24.66\AA$ and magnetic propagation vectors $\mathbf{k}=\left(\frac{1}{2}\frac{1}{2}\frac{1}{2}\right)$ and $\left(00.6250\right)$ at 20 mK.

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• Frustrated magnetism
• Minerals
• Perovskites
• Magnetization measurements
• Neutron diffraction
• Specific heat measurements