The crystal structure of anosovite, (Ti
4+O 5 , prepared by carbothermal reduction of leucoxene under vacuum at 1450°C has been refined by Rietveld method using powder X-ray diffraction data. It was found that it represents slightly monoclinically deformed pseudobrookite type structure with lattice parameters a = 9.8111 Å, b = 3.7509 Å, c = 9.9468 Å, β = 90.628°.