The powder neutron diffraction pattern of pyrolusite, ß-MnO2 [P42/mnm, No. 136, a = 4.4041(1), c = 2.8765(1)?], has been refined by the Rietveld method to give values for both the oxygen position parameter u=0.3046(1) and the anisotropic thermal parameters. The data confirm the MnO6 octahedra to be elongated with two long [1.894(1)?] and four short [1.882(2)?] Mn-O bond distances. The effect of the stereochemistry on the thermal vibrations is discussed.
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Bolzan et al. (1993) studied this question.
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