Abstract
The crystal structure of the mineral analcime, NaAISi206 . H20, known from x-ray analysis to approximate closely to the cubic space-group symmetry Ia3d, has been examined by neutron diffraction. Intensity data from a single crystal were collected for one octant so as to be representative of cubic and some lower symmetries. In general, the systematic absences were consistent with the space group Ia3d; within experimental error, the six reflections equivalent for Laue group m 3 m were equal in intensity. From Fourier difference syntheses and least-squares refinements, it is concluded that the neutron data, like the x-ray data, are consistent with an averaged Ia3d structure. Full-matrix
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