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A pure sample of Utah halloysite has been subjected to an X-ray diffraction study. The X-ray line profiles have been studied in the light of a theory of diffraction by curved crystals developed in this paper. It is concluded that metahalloysite has a lath-like cylindrical structure and the kaolin layers are considered to be arranged parallel to one another but shifted parallel to themselves. Experimental results have been compared with the theoretical calculations and a satisfactory model with the values of the lattice parameters has been proposed. Observed and calculated line profiles agree with this model fairly satisfactorily.

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