Abstract: Single crystals of “malakhovite” (an anthropogenic silico-oxide from burnt dumps of the Chelyabinsk coal basin; sp. gr. (Formula presented.), a = 10.555(4) Å, b = 10.928(3) Å, c = 9.059(3) Å, α = 106.338(12)°, β = 95.87(7)°, γ = 124.40(2)°, V = 781.0(5) ų, Z = 1, R₁ = 0.0378 have been investigated by electron-probe microanalysis, Raman spectroscopy, and X-ray diffraction analysis. The idealized formula of the mineral is Ca₄(Fe_8.56³⁺Mg_1.72Ca_0.82Fe_0.55²⁺Mn_0.22Ti_0.13)_Σ12.00(Fe_6.48³⁺Al_2.82Si_2.71)_Σ12.01O₄₀. It is shown that malakhovite is not only chemical but also crystal chemical anthropogenic analogue of khesinite (Ca₄Mg₂Fe₁₀³⁺O₄Fe₁₀³⁺Si₂O₃₆). The relationships between the malakhovite and the minerals from the dorrite–khesinite series of the rhönite group in the sapphirine supergroup are discussed.