A number of recent papers have discussed the Hall effect in a material consisting of high‐conductivity grains surrounded by thin low‐conductivity layers. These discussions were based on a model in which the grains are identical parallel cubes and the layers are of uniform thickness. The effective Hall constant of this model is approximately equal to the Hall constant of the grains. To test the effect of grain geometry on the effective Hall constant, the present paper discusses the Hall effect in the ``composite sphere'' material in which the grains are spheres of various sizes and the intergranular layers are formed from spherical shells. In this model also the effective Hall constant is approximately equal to the Hall constant of the grains, suggesting that, in general, the effective Hall constant is not strongly dependent on the grain geometry.