A number of techniques to reduce preferred orientation in samples for x-ray powder diffraction patterns were studied. Minerals were mounted in ethyl cellulose spindles and spheres, on greased Lindemann glass rods, and in nylon tubes. Gross differences in intensities of diffraction lines are demonstrated on films showing random and preferred orientation of fibrous pectolite and platy paragonite mica. The sphere-mount method was shown to be the most successful and convenient method for achieving random orientation and thus for obtaining more nearly correct intensities of diffraction lines.

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