Abstract
A technique is described to determine the three-dimensional orientation of platy clay minerals and mineral aggregates in soil thin-sections by means of a polarizing microscope equipped with a universal stage and a Berek compensator. The method utilizes the established geometrical relationships between the basal cleavage and the maximum or minimum apparent birefringence in an arbitrary cross-section of a platy clay mineral. Applying this method, it is unnecessary to know or determine the thickness of the thin-section, the refractive indices or the actual birefringence of the clay minerals involved.
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