The tetragonal-to-cubic structural phase transition in pollucite (CsAlSi 2 O 6 ) was investigated using low-temperature X-ray powder diffraction in the temperature range of 93 to 298 K, and the lattice constants were refined with Rietveld analysis. It was found that CsAlSi 2 O 6 had a tetragonal phase with a space group of I4 1 /acd in the temperature range of 93 to 248 K, a = 1.36337(4) nm, c = 1.36988(6) nm at 248 K, and underwent a phase transition from tetragonal to cubic with a space group of Ia-3d in the temperature range of 248 to 273 K, a = 1.36645(3) nm at 273 K.
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